diff --git a/blade-auth/src/main/java/org/springblade/auth/handler/BladeAuthorizationHandler.java b/blade-auth/src/main/java/org/springblade/auth/handler/BladeAuthorizationHandler.java
index 2c12576a..eba9dc15 100644
--- a/blade-auth/src/main/java/org/springblade/auth/handler/BladeAuthorizationHandler.java
+++ b/blade-auth/src/main/java/org/springblade/auth/handler/BladeAuthorizationHandler.java
@@ -84,16 +84,11 @@ public class BladeAuthorizationHandler extends AbstractAuthorizationHandler {
 			if (bladeProperties.isProd() && isWeakPassword(request.getPassword())) {
 				return buildValidationFailure(ExceptionCode.INVALID_USER_PASSWORD);
 			}
-			// 判断账号是否锁定
+			// 仅按账号锁定；不做 IP 锁定，避免同出口/网关 IP 下一人失败牵连全部未登录用户
 			OAuth2Validation accountValidation = lockHandler.validateAccountLock(request.getTenantId(), request.getUsername());
 			if (!accountValidation.isSuccess()) {
 				return accountValidation;
 			}
-			// 判断IP是否锁定
-			OAuth2Validation ipValidation = lockHandler.validateIpLock(request.getTenantId());
-			if (!ipValidation.isSuccess()) {
-				return ipValidation;
-			}
 		}
 		return super.preValidation(request);
 	}
@@ -105,7 +100,13 @@ public class BladeAuthorizationHandler extends AbstractAuthorizationHandler {
 	 */
 	@Override
 	public void preFailure(OAuth2Request request, OAuth2Validation validation) {
-		// 处理认证失败，增加错误次数
+		// 已因锁定失败时不再累加失败次数，避免其他账号重试时被误计并连带锁定
+		if (validation != null && !validation.isSuccess()
+			&& ExceptionCode.USER_TOO_MANY_FAILS.getCode() == validation.getCode()) {
+			log.error("用户：{}，认证失败，失败原因：{}", request.getUsername(), validation.getMessage());
+			return;
+		}
+		// 处理认证失败，增加错误次数（仅账号维度）
 		lockHandler.handleAuthFailure(request.getTenantId(), request.getUsername());
 
 		log.error("用户：{}，认证失败，失败原因：{}", request.getUsername(), validation.getMessage());
diff --git a/blade-auth/src/main/java/org/springblade/auth/handler/BladeLockHandler.java b/blade-auth/src/main/java/org/springblade/auth/handler/BladeLockHandler.java
index ad90ea7d..af423cf4 100644
--- a/blade-auth/src/main/java/org/springblade/auth/handler/BladeLockHandler.java
+++ b/blade-auth/src/main/java/org/springblade/auth/handler/BladeLockHandler.java
@@ -90,7 +90,7 @@ public class BladeLockHandler {
 
 	/**
 	 * 处理认证失败
-	 * 同时增加账号和IP错误次数
+	 * 仅增加账号错误次数；不再累计 IP 失败次数，避免共享出口 IP 误伤其他用户。
 	 *
 	 * @param tenantId 租户id
 	 * @param account  账号
@@ -102,7 +102,6 @@ public class BladeLockHandler {
 		CompletableFuture.runAsync(() -> {
 			try {
 				authLockClient.addAccountFailCount(tenantId, account, userId, ip, userAgent);
-				authLockClient.addIpFailCount(tenantId, ip, userAgent);
 			} catch (Exception e) {
 				log.warn("认证失败计数异常: {}", e.getMessage());
 			}
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/FormalSettlementSaveRequest.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/FormalSettlementSaveRequest.java
index 73ba9991..d001adb4 100644
--- a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/FormalSettlementSaveRequest.java
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/FormalSettlementSaveRequest.java
@@ -32,6 +32,8 @@ public class FormalSettlementSaveRequest implements Serializable {
 	private String remark;
 	private List<SummaryFee> summaryFees;
 	private List<Invoice> invoices;
+	/** 项目预付核销 */
+	private List<SettlementProjectAdvanceWriteOffRequest> projectAdvanceWriteOffs;
 
 	@Data
 	public static class DetailAdjustment implements Serializable {
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/PreSettlementSaveRequest.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/PreSettlementSaveRequest.java
index dbe0667d..b2c670b7 100644
--- a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/PreSettlementSaveRequest.java
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/PreSettlementSaveRequest.java
@@ -76,6 +76,9 @@ public class PreSettlementSaveRequest implements Serializable {
 	@Schema(description = "结算合计费用")
 	private List<SummaryFee> summaryFees;
 
+	@Schema(description = "项目预付核销")
+	private List<SettlementProjectAdvanceWriteOffRequest> projectAdvanceWriteOffs;
+
 	@Data
 	@Schema(description = "结算合计费用")
 	public static class SummaryFee implements Serializable {
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/SettlementProjectAdvanceWriteOffRequest.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/SettlementProjectAdvanceWriteOffRequest.java
new file mode 100644
index 00000000..be281de0
--- /dev/null
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/dto/SettlementProjectAdvanceWriteOffRequest.java
@@ -0,0 +1,53 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * 1. This software is for development use only under a valid license
+ * from BladeX.
+ * <p>
+ * 2. Redistribution of this software's source code to any third party
+ * without a commercial license is strictly prohibited.
+ * <p>
+ * 3. Licensees may copyright their own code but cannot use segments
+ * from this software for such purposes. Copyright of this software
+ * remains with BladeX.
+ * <p>
+ * Using this software signifies agreement to this License, and the software
+ * must not be used for illegal purposes.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY. The author is
+ * not liable for any claims arising from secondary or illegal development.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.pojo.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.math.BigDecimal;
+
+/**
+ * 结算单项目预付核销保存行
+ *
+ * @author Chill
+ */
+@Data
+@Schema(description = "结算单项目预付核销保存行")
+public class SettlementProjectAdvanceWriteOffRequest implements Serializable {
+
+	@Serial
+	private static final long serialVersionUID = 1L;
+
+	@Schema(description = "项目预付付款申请ID")
+	private Long paymentApplicationId;
+
+	@Schema(description = "本次核销金额")
+	private BigDecimal writeOffAmount;
+
+}
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/entity/SettlementProjectAdvanceWriteOff.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/entity/SettlementProjectAdvanceWriteOff.java
new file mode 100644
index 00000000..57be9c22
--- /dev/null
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/entity/SettlementProjectAdvanceWriteOff.java
@@ -0,0 +1,90 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * 1. This software is for development use only under a valid license
+ * from BladeX.
+ * <p>
+ * 2. Redistribution of this software's source code to any third party
+ * without a commercial license is strictly prohibited.
+ * <p>
+ * 3. Licensees may copyright their own code but cannot use segments
+ * from this software for such purposes. Copyright of this software
+ * remains with BladeX.
+ * <p>
+ * Using this software signifies agreement to this License, and the software
+ * must not be used for illegal purposes.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY. The author is
+ * not liable for any claims arising from secondary or illegal development.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.pojo.entity;
+
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableName;
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import org.springblade.core.tenant.mp.TenantEntity;
+
+import java.io.Serial;
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * 结算单项目预付核销实体类
+ *
+ * @author Chill
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+@TableName("blade_settlement_project_advance_write_off")
+@Schema(description = "结算单项目预付核销")
+public class SettlementProjectAdvanceWriteOff extends TenantEntity {
+
+	@Serial
+	private static final long serialVersionUID = 1L;
+
+	@Schema(description = "结算单类型：pre/formal")
+	private String settlementType;
+
+	@JsonSerialize(using = ToStringSerializer.class)
+	@Schema(description = "预结算/正式结算单ID")
+	private Long settlementId;
+
+	@JsonSerialize(using = ToStringSerializer.class)
+	@Schema(description = "项目预付付款申请ID")
+	private Long paymentApplicationId;
+
+	@Schema(description = "预付单号")
+	private String paymentNo;
+
+	@Schema(description = "项目预付金额")
+	private BigDecimal projectAdvanceAmount;
+
+	@Schema(description = "本次核销金额")
+	private BigDecimal writeOffAmount;
+
+	@Schema(description = "金蝶预付单号")
+	private String kingdeeBillNo;
+
+	@TableField(exist = false)
+	@Schema(description = "可核销金额（动态计算）")
+	private BigDecimal availableWriteOffAmount;
+
+	@TableField(exist = false)
+	@Schema(description = "预付单创建人姓名")
+	private String createUserName;
+
+	@TableField(exist = false)
+	@Schema(description = "预付单创建时间（展示用）")
+	private Date paymentCreateTime;
+
+}
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/FormalSettlementVO.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/FormalSettlementVO.java
index 2702fbb5..dc889541 100644
--- a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/FormalSettlementVO.java
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/FormalSettlementVO.java
@@ -20,6 +20,7 @@ import org.springblade.transport.pojo.entity.FormalSettlementSource;
 import org.springblade.transport.pojo.entity.FormalSettlementPayment;
 import org.springblade.transport.pojo.entity.FormalSettlementSummaryFee;
 import org.springblade.transport.pojo.entity.InvoiceApplicationInvoice;
+import org.springblade.transport.pojo.entity.SettlementProjectAdvanceWriteOff;
 import org.springframework.format.annotation.DateTimeFormat;
 
 import java.io.Serial;
@@ -64,6 +65,8 @@ public class FormalSettlementVO extends FormalSettlement implements KingdeeUnloc
 	@TableField(exist = false) private List<FormalSettlementSummaryFee> summaryFees;
 	@TableField(exist = false) private List<FormalSettlementPayment> payments;
 	@TableField(exist = false) private List<FormalSettlementInvoice> invoices;
+	@TableField(exist = false) @Schema(description = "项目预付核销")
+	private List<SettlementProjectAdvanceWriteOff> projectAdvanceWriteOffs;
 	@TableField(exist = false) @Schema(description = "开票申请经金蝶回写的发票结果（含文件地址，只读展示）")
 	private List<InvoiceApplicationInvoice> issuedInvoices;
 	@TableField(exist = false) private List<PaymentApplicationVO> paymentApplications;
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/PreSettlementVO.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/PreSettlementVO.java
index f4573a63..36955339 100644
--- a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/PreSettlementVO.java
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/PreSettlementVO.java
@@ -35,6 +35,7 @@ import org.springblade.transport.pojo.entity.PreSettlementChangeRecord;
 import org.springblade.transport.pojo.entity.PreSettlementDetail;
 import org.springblade.transport.pojo.entity.PreSettlementDetailFee;
 import org.springblade.transport.pojo.entity.PreSettlementSummaryFee;
+import org.springblade.transport.pojo.entity.SettlementProjectAdvanceWriteOff;
 import org.springframework.format.annotation.DateTimeFormat;
 
 import java.io.Serial;
@@ -100,6 +101,10 @@ public class PreSettlementVO extends PreSettlement {
 	@Schema(description = "预付信息")
 	private List<PreSettlementAdvance> advances;
 
+	@TableField(exist = false)
+	@Schema(description = "项目预付核销")
+	private List<SettlementProjectAdvanceWriteOff> projectAdvanceWriteOffs;
+
 	@TableField(exist = false)
 	@Schema(description = "变更记录")
 	private List<PreSettlementChangeRecord> changeRecords;
diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/ProjectAdvanceWriteOffOptionVO.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/ProjectAdvanceWriteOffOptionVO.java
new file mode 100644
index 00000000..42d85b13
--- /dev/null
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/ProjectAdvanceWriteOffOptionVO.java
@@ -0,0 +1,72 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * 1. This software is for development use only under a valid license
+ * from BladeX.
+ * <p>
+ * 2. Redistribution of this software's source code to any third party
+ * without a commercial license is strictly prohibited.
+ * <p>
+ * 3. Licensees may copyright their own code but cannot use segments
+ * from this software for such purposes. Copyright of this software
+ * remains with BladeX.
+ * <p>
+ * Using this software signifies agreement to this License, and the software
+ * must not be used for illegal purposes.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY. The author is
+ * not liable for any claims arising from secondary or illegal development.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.pojo.vo;
+
+import com.fasterxml.jackson.databind.annotation.JsonSerialize;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.math.BigDecimal;
+import java.util.Date;
+
+/**
+ * 可选项目预付核销选项
+ *
+ * @author Chill
+ */
+@Data
+@Schema(description = "可选项目预付核销选项")
+public class ProjectAdvanceWriteOffOptionVO implements Serializable {
+
+	@Serial
+	private static final long serialVersionUID = 1L;
+
+	@JsonSerialize(using = ToStringSerializer.class)
+	@Schema(description = "付款申请ID")
+	private Long paymentApplicationId;
+
+	@Schema(description = "预付单号")
+	private String paymentNo;
+
+	@Schema(description = "项目预付金额")
+	private BigDecimal projectAdvanceAmount;
+
+	@Schema(description = "可核销金额")
+	private BigDecimal availableWriteOffAmount;
+
+	@Schema(description = "金蝶预付单号")
+	private String kingdeeBillNo;
+
+	@Schema(description = "创建人姓名")
+	private String createUserName;
+
+	@Schema(description = "创建时间")
+	private Date createTime;
+
+}
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/TransportBusiConstant.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/TransportBusiConstant.java
index cf5e82b3..f27ce70d 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/TransportBusiConstant.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/TransportBusiConstant.java
@@ -31,9 +31,21 @@ package org.springblade.transport.constant;
  */
 public final class TransportBusiConstant {
 
+	/** 付款类型：项目预付。 */
+	public static final String PAYMENT_TYPE_PROJECT_ADVANCE = "project_advance";
+
+	/** 付款类型：进度预付。 */
+	public static final String PAYMENT_TYPE_PROGRESS_ADVANCE = "progress_advance";
+
 	/** 付款类型：结算付款（关联正式结算单的正式付款）。 */
 	public static final String PAYMENT_TYPE_SETTLEMENT = "settlement_payment";
 
+	/** 结算单类型：预结算。 */
+	public static final String SETTLEMENT_BILL_PRE = "pre";
+
+	/** 结算单类型：正式结算。 */
+	public static final String SETTLEMENT_BILL_FORMAL = "formal";
+
 	/** 审批状态：草稿（允许编辑、删除）。 */
 	public static final String DRAFT = "draft";
 
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/PaymentApplicationController.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/PaymentApplicationController.java
index 92a7f5a2..ae6f6796 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/PaymentApplicationController.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/PaymentApplicationController.java
@@ -34,6 +34,7 @@ import org.springblade.transport.pojo.dto.PaymentApplicationSaveRequest;
 import org.springblade.transport.pojo.dto.PaymentApplicationStatusRequest;
 import org.springblade.transport.pojo.vo.PaymentApplicationReferenceAmountVO;
 import org.springblade.transport.pojo.vo.PaymentApplicationVO;
+import org.springblade.transport.pojo.vo.ProjectAdvanceWriteOffOptionVO;
 import org.springblade.transport.service.IPaymentApplicationService;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -67,6 +68,17 @@ public class PaymentApplicationController extends BladeController {
 		@RequestParam Long referenceId, @RequestParam(required = false) Long excludeId) {
 		return R.data(paymentApplicationService.referenceAmount(paymentType, referenceId, excludeId));
 	}
+
+	@GetMapping("/project-advance-write-off-options")
+	@ApiOperationSupport(order = 3)
+	@Operation(summary = "按合同查询可选项目预付核销列表")
+	public R<List<ProjectAdvanceWriteOffOptionVO>> projectAdvanceWriteOffOptions(
+		@RequestParam Long contractId,
+		@RequestParam(required = false) String excludeSettlementType,
+		@RequestParam(required = false) Long excludeSettlementId) {
+		return R.data(paymentApplicationService.projectAdvanceWriteOffOptions(
+			contractId, excludeSettlementType, excludeSettlementId));
+	}
 	@PostMapping("/save")
 	@ApiOperationSupport(order = 4)
 	@Operation(summary = "保存付款申请")
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/SettlementProjectAdvanceWriteOffMapper.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/SettlementProjectAdvanceWriteOffMapper.java
new file mode 100644
index 00000000..a9aa2767
--- /dev/null
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/SettlementProjectAdvanceWriteOffMapper.java
@@ -0,0 +1,40 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.springblade.transport.pojo.entity.SettlementProjectAdvanceWriteOff;
+
+import java.math.BigDecimal;
+
+/**
+ * 结算单项目预付核销 Mapper
+ *
+ * @author Chill
+ */
+@Mapper
+public interface SettlementProjectAdvanceWriteOffMapper extends BaseMapper<SettlementProjectAdvanceWriteOff> {
+
+	/**
+	 * 统计项目预付已核销金额（排除作废结算单，可排除当前结算单）。
+	 */
+	BigDecimal sumWriteOffByPaymentApplication(@Param("paymentApplicationId") Long paymentApplicationId,
+											   @Param("excludeSettlementType") String excludeSettlementType,
+											   @Param("excludeSettlementId") Long excludeSettlementId);
+
+	/**
+	 * 统计结算单核销合计。
+	 */
+	BigDecimal sumWriteOffBySettlement(@Param("settlementType") String settlementType,
+									   @Param("settlementId") Long settlementId);
+
+}
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/SettlementProjectAdvanceWriteOffMapper.xml b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/SettlementProjectAdvanceWriteOffMapper.xml
new file mode 100644
index 00000000..3c21ab32
--- /dev/null
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/SettlementProjectAdvanceWriteOffMapper.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="org.springblade.transport.mapper.SettlementProjectAdvanceWriteOffMapper">
+
+    <select id="sumWriteOffByPaymentApplication" resultType="java.math.BigDecimal">
+        SELECT COALESCE(SUM(w.write_off_amount), 0)
+        FROM blade_settlement_project_advance_write_off w
+        LEFT JOIN blade_pre_settlement p
+            ON w.settlement_type = 'pre'
+            AND w.settlement_id = p.id
+            AND p.is_deleted = 0
+        LEFT JOIN blade_formal_settlement f
+            ON w.settlement_type = 'formal'
+            AND w.settlement_id = f.id
+            AND f.is_deleted = 0
+        WHERE w.is_deleted = 0
+          AND w.payment_application_id = #{paymentApplicationId}
+          AND (
+                (w.settlement_type = 'pre' AND p.id IS NOT NULL AND IFNULL(p.approval_status, '') &lt;&gt; 'voided')
+             OR (w.settlement_type = 'formal' AND f.id IS NOT NULL AND IFNULL(f.approval_status, '') &lt;&gt; 'voided')
+          )
+        <if test="excludeSettlementType != null and excludeSettlementId != null">
+          AND NOT (w.settlement_type = #{excludeSettlementType} AND w.settlement_id = #{excludeSettlementId})
+        </if>
+    </select>
+
+    <select id="sumWriteOffBySettlement" resultType="java.math.BigDecimal">
+        SELECT COALESCE(SUM(write_off_amount), 0)
+        FROM blade_settlement_project_advance_write_off
+        WHERE is_deleted = 0
+          AND settlement_type = #{settlementType}
+          AND settlement_id = #{settlementId}
+    </select>
+
+</mapper>
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IPaymentApplicationService.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IPaymentApplicationService.java
index 6d4807af..e68ec0c0 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IPaymentApplicationService.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IPaymentApplicationService.java
@@ -28,6 +28,7 @@ import org.springblade.transport.pojo.dto.PaymentApplicationStatusRequest;
 import org.springblade.transport.pojo.entity.PaymentApplication;
 import org.springblade.transport.pojo.vo.PaymentApplicationReferenceAmountVO;
 import org.springblade.transport.pojo.vo.PaymentApplicationVO;
+import org.springblade.transport.pojo.vo.ProjectAdvanceWriteOffOptionVO;
 
 import java.util.List;
 
@@ -36,6 +37,11 @@ public interface IPaymentApplicationService extends BaseService<PaymentApplicati
 	IPage<PaymentApplicationVO> selectPage(IPage<PaymentApplication> page, PaymentApplicationVO query);
 	PaymentApplicationVO detail(Long id);
 	PaymentApplicationReferenceAmountVO referenceAmount(String paymentType, Long referenceId, Long excludeId);
+
+	/** 按合同查询可选项目预付核销列表。 */
+	List<ProjectAdvanceWriteOffOptionVO> projectAdvanceWriteOffOptions(Long contractId,
+																	   String excludeSettlementType,
+																	   Long excludeSettlementId);
 	Long saveDraft(PaymentApplicationSaveRequest request);
 	void removeDraft(Long id);
 	void submit(PaymentApplicationStatusRequest request);
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/ISettlementProjectAdvanceWriteOffService.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/ISettlementProjectAdvanceWriteOffService.java
new file mode 100644
index 00000000..9c1d7368
--- /dev/null
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/ISettlementProjectAdvanceWriteOffService.java
@@ -0,0 +1,53 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.service;
+
+import org.springblade.transport.pojo.dto.SettlementProjectAdvanceWriteOffRequest;
+import org.springblade.transport.pojo.entity.SettlementProjectAdvanceWriteOff;
+import org.springblade.transport.pojo.vo.ProjectAdvanceWriteOffOptionVO;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+/**
+ * 结算单项目预付核销服务
+ *
+ * @author Chill
+ */
+public interface ISettlementProjectAdvanceWriteOffService {
+
+	/**
+	 * 按合同查询可选项目预付（审批通过且仍有可核销余额）。
+	 */
+	List<ProjectAdvanceWriteOffOptionVO> listOptions(Long contractId, String excludeSettlementType,
+													 Long excludeSettlementId);
+
+	/**
+	 * 查询结算单已保存的核销明细（含动态可核销金额）。
+	 */
+	List<SettlementProjectAdvanceWriteOff> listBySettlement(String settlementType, Long settlementId);
+
+	/**
+	 * 结算单核销金额合计。
+	 */
+	BigDecimal sumBySettlement(String settlementType, Long settlementId);
+
+	/**
+	 * 覆盖保存核销明细，并校验不超过可核销金额与结算单金额。
+	 */
+	void replaceWriteOffs(String settlementType, Long settlementId, Long contractId,
+						  BigDecimal settlementAmount, List<SettlementProjectAdvanceWriteOffRequest> writeOffs);
+
+	/**
+	 * 物理清理结算单核销明细（草稿删除时）。
+	 */
+	void deleteBySettlement(String settlementType, Long settlementId);
+
+}
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/CommonRouteServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/CommonRouteServiceImpl.java
index b2b2da65..2c8ec740 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/CommonRouteServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/CommonRouteServiceImpl.java
@@ -30,6 +30,7 @@ import org.springblade.core.log.exception.ServiceException;
 import org.springblade.core.mp.base.BaseServiceImpl;
 import org.springblade.core.tool.utils.BeanUtil;
 import org.springblade.core.tool.utils.Func;
+import org.springblade.system.cache.SysCache;
 import org.springblade.system.cache.UserCache;
 import org.springblade.system.pojo.entity.Dept;
 import org.springblade.transport.excel.CommonRouteExportExcel;
@@ -217,12 +218,32 @@ public class CommonRouteServiceImpl extends BaseServiceImpl<CommonRouteMapper, C
 		commonRoute.setArrivalPhone(TransportBusinessSupport.trimToNull(commonRoute.getArrivalPhone()));
 		commonRoute.setDeptName(TransportBusinessSupport.trimToNull(commonRoute.getDeptName()));
 		commonRoute.setRemark(TransportBusinessSupport.trimToNull(commonRoute.getRemark()));
-		if (Func.isEmpty(commonRoute.getDeptId())) {
+		// 仅新增时绑定组织；编辑沿用原组织（submit 中已从旧记录写回）。
+		if (Func.isEmpty(commonRoute.getId())) {
+			bindDeptOnCreate(commonRoute);
+		}
+		if (commonRoute.getStatus() == null) { commonRoute.setStatus(1); }
+	}
+
+	/**
+	 * 新增绑定所属组织：普通用户始终落当前组织；超管可按入参组织保存，未传时回落当前组织。
+	 */
+	private void bindDeptOnCreate(CommonRoute commonRoute) {
+		if (commonRoute == null) {
+			return;
+		}
+		boolean administrator = TransportBusinessSupport.isAdministrator();
+		if (!administrator || Func.isEmpty(commonRoute.getDeptId()) || commonRoute.getDeptId() <= 0) {
 			Dept dept = TransportBusinessSupport.currentDept("常用线路");
 			commonRoute.setDeptId(dept.getId());
 			commonRoute.setDeptName(dept.getDeptName());
+			return;
 		}
-		if (commonRoute.getStatus() == null) { commonRoute.setStatus(1); }
+		Dept dept = SysCache.getDept(commonRoute.getDeptId());
+		if (Func.isEmpty(dept)) {
+			throw new ServiceException("所属组织不存在或已删除");
+		}
+		commonRoute.setDeptName(TransportBusinessSupport.trimToNull(dept.getDeptName()));
 	}
 
 	private void validate(CommonRoute commonRoute) {
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/FormalSettlementServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/FormalSettlementServiceImpl.java
index cc72d33b..c68b021d 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/FormalSettlementServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/FormalSettlementServiceImpl.java
@@ -88,6 +88,7 @@ import org.springblade.transport.service.IInvoiceReceiptService;
 import org.springblade.transport.service.IKingdeeBillLockService;
 import org.springblade.transport.service.IContractManageService;
 import org.springblade.transport.service.IPreSettlementService;
+import org.springblade.transport.service.ISettlementProjectAdvanceWriteOffService;
 import org.springblade.transport.service.IWaybillService;
 import org.springblade.transport.service.KingdeeSyncContext;
 import org.springblade.transport.support.KingdeeApBillSyncSupport;
@@ -170,6 +171,7 @@ public class FormalSettlementServiceImpl extends BaseServiceImpl<FormalSettlemen
 	private final SettlementAdjustmentMapper settlementAdjustmentMapper;
 	private final IContractManageService contractManageService;
 	private final IPreSettlementService preSettlementService;
+	private final ISettlementProjectAdvanceWriteOffService projectAdvanceWriteOffService;
 	private final IWaybillService waybillService;
 	private final KingdeeApBillSyncSupport kingdeeApBillSyncSupport;
 	private final KingdeeArBillSyncSupport kingdeeArBillSyncSupport;
@@ -318,6 +320,8 @@ public class FormalSettlementServiceImpl extends BaseServiceImpl<FormalSettlemen
 			.eq(FormalSettlementPayment::getFormalSettlementId, id).orderByDesc(FormalSettlementPayment::getCreateTime)));
 		vo.setInvoices(listInvoices(settlement));
 		vo.setIssuedInvoices(listIssuedInvoices(id));
+		vo.setProjectAdvanceWriteOffs(projectAdvanceWriteOffService.listBySettlement(
+			TransportBusiConstant.SETTLEMENT_BILL_FORMAL, id));
 		Set<Long> relationApplicationIds = paymentApplicationSettlementMapper.selectList(
 			Wrappers.<PaymentApplicationSettlement>lambdaQuery()
 				.select(PaymentApplicationSettlement::getPaymentApplicationId)
@@ -541,6 +545,12 @@ public class FormalSettlementServiceImpl extends BaseServiceImpl<FormalSettlemen
 		applySummaryRequest(settlement.getId(), request.getSummaryFees());
 		refreshSettlementAmount(settlement);
 		rebuildInvoices(settlement, request.getInvoices());
+		projectAdvanceWriteOffService.replaceWriteOffs(
+			TransportBusiConstant.SETTLEMENT_BILL_FORMAL,
+			settlement.getId(),
+			settlement.getContractId(),
+			settlement.getSettlementAmount(),
+			request.getProjectAdvanceWriteOffs());
 		if (!creating && !restoring) {
 			saveChange(settlement.getId(), "结算单基本信息", null, "调整",
 				"保存正式结算单" + settlement.getFormalSettlementNo(), request.getRemark());
@@ -562,6 +572,7 @@ public class FormalSettlementServiceImpl extends BaseServiceImpl<FormalSettlemen
 			.eq(FormalSettlementSummaryFee::getFormalSettlementId, id));
 		invoiceMapper.delete(Wrappers.<FormalSettlementInvoice>lambdaQuery()
 			.eq(FormalSettlementInvoice::getFormalSettlementId, id));
+		projectAdvanceWriteOffService.deleteBySettlement(TransportBusiConstant.SETTLEMENT_BILL_FORMAL, id);
 		changeRecordMapper.delete(Wrappers.<FormalSettlementChangeRecord>lambdaQuery()
 			.eq(FormalSettlementChangeRecord::getFormalSettlementId, id));
 		removeById(id);
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PaymentApplicationServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PaymentApplicationServiceImpl.java
index 742b5931..38057c1a 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PaymentApplicationServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PaymentApplicationServiceImpl.java
@@ -98,7 +98,9 @@ import org.springblade.transport.pojo.vo.PaymentApplicationVO;
 import org.springblade.transport.service.IFormalSettlementService;
 import org.springblade.transport.service.IKingdeeBillLockService;
 import org.springblade.transport.service.IPaymentApplicationService;
+import org.springblade.transport.service.ISettlementProjectAdvanceWriteOffService;
 import org.springblade.transport.service.KingdeeSyncContext;
+import org.springblade.transport.pojo.vo.ProjectAdvanceWriteOffOptionVO;
 import org.springblade.transport.support.KingdeeApBillSyncSupport;
 import org.springblade.transport.support.KingdeeAttachmentSyncSupport;
 import org.springblade.transport.support.KingdeeSyncLockSupport;
@@ -159,6 +161,7 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 	private final BillLedgerUsageMapper billLedgerUsageMapper;
 	private final TemporaryCreditLimitMapper temporaryCreditLimitMapper;
 	private final IFormalSettlementService formalSettlementService;
+	private final ISettlementProjectAdvanceWriteOffService projectAdvanceWriteOffService;
 	private final IKingdeeBillLockService kingdeeBillLockService;
 	private final IBfiService bfiService;
 	private final KingdeeApBillSyncSupport kingdeeApBillSyncSupport;
@@ -301,13 +304,24 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 		BigDecimal cumulativeAppliedAmount = preSettlementReference
 			? cumulativePreSettlementApplied(referenceId, excludeId)
 			: cumulativeFormalSettlementApplied(referenceId, excludeId);
+		BigDecimal writeOffAmount = preSettlementReference
+			? projectAdvanceWriteOffService.sumBySettlement(TransportBusiConstant.SETTLEMENT_BILL_PRE, referenceId)
+			: projectAdvanceWriteOffService.sumBySettlement(TransportBusiConstant.SETTLEMENT_BILL_FORMAL, referenceId);
 		PaymentApplicationReferenceAmountVO amount = new PaymentApplicationReferenceAmountVO();
 		amount.setSettlementAmount(settlementAmount);
-		amount.setCumulativeAppliedAmount(cumulativeAppliedAmount);
-		amount.setPayableAmount(settlementAmount.subtract(cumulativeAppliedAmount));
+		amount.setCumulativeAppliedAmount(cumulativeAppliedAmount.add(writeOffAmount));
+		amount.setPayableAmount(settlementAmount.subtract(cumulativeAppliedAmount).subtract(writeOffAmount)
+			.max(BigDecimal.ZERO));
 		return amount;
 	}
 
+	@Override
+	public List<ProjectAdvanceWriteOffOptionVO> projectAdvanceWriteOffOptions(Long contractId,
+																			  String excludeSettlementType,
+																			  Long excludeSettlementId) {
+		return projectAdvanceWriteOffService.listOptions(contractId, excludeSettlementType, excludeSettlementId);
+	}
+
 	@Override
 	@Transactional(rollbackFor = Exception.class)
 	public Long saveDraft(PaymentApplicationSaveRequest request) {
@@ -1741,12 +1755,12 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 			if (source == null) throw new ServiceException("正式结算单不存在");
 			if (!TransportBusiConstant.APPROVED.equals(source.getApprovalStatus())) throw new ServiceException("只能选择审批通过、未作废的正式结算单");
 			entity.setSettlementId(source.getId()); entity.setSettlementNo(source.getFormalSettlementNo()); entity.setPreSettlementId(null); entity.setPreSettlementNo(null);
-			entity.setProjectId(source.getProjectId()); entity.setProjectName(source.getProjectName()); entity.setDeptId(source.getDeptId()); entity.setDeptName(source.getDeptName()); entity.setContractId(source.getContractId()); entity.setContractNo(source.getContractNo()); entity.setContractName(source.getContractName()); entity.setPayerName(source.getPayerName()); entity.setPayeeName(source.getPayeeName()); entity.setSettlementAmount(source.getSettlementAmount()); entity.setPayableAmount(money(source.getSettlementAmount()).subtract(cumulativeFormalSettlementApplied(source.getId(), entity.getId()))); entity.setBillType("正式结算单");
+			entity.setProjectId(source.getProjectId()); entity.setProjectName(source.getProjectName()); entity.setDeptId(source.getDeptId()); entity.setDeptName(source.getDeptName()); entity.setContractId(source.getContractId()); entity.setContractNo(source.getContractNo()); entity.setContractName(source.getContractName()); entity.setPayerName(source.getPayerName()); entity.setPayeeName(source.getPayeeName()); entity.setSettlementAmount(source.getSettlementAmount()); entity.setPayableAmount(payableOfFormalSettlement(source.getId(), source.getSettlementAmount(), entity.getId())); entity.setBillType("正式结算单");
 		} else if (request.getPreSettlementId() != null) {
 			PreSettlement source = preSettlementMapper.selectById(request.getPreSettlementId());
 			if (source == null) throw new ServiceException("预结算单不存在");
 			if (!TransportBusiConstant.APPROVED.equals(source.getApprovalStatus())) throw new ServiceException("只能选择审批通过、未作废的预结算单");
-			entity.setPreSettlementId(source.getId()); entity.setPreSettlementNo(source.getPreSettlementNo()); entity.setSettlementId(null); entity.setSettlementNo(null); entity.setProjectId(source.getProjectId()); entity.setProjectName(source.getProjectName()); entity.setDeptId(source.getDeptId()); entity.setDeptName(source.getDeptName()); entity.setContractId(source.getContractId()); entity.setContractNo(source.getContractNo()); entity.setContractName(source.getContractName()); entity.setPayerName(source.getPayerName()); entity.setPayeeName(source.getPayeeName()); entity.setSettlementAmount(source.getSettlementAmount()); entity.setPayableAmount(money(source.getSettlementAmount()).subtract(cumulativePreSettlementApplied(source.getId(), entity.getId()))); entity.setBillType("预结算单");
+			entity.setPreSettlementId(source.getId()); entity.setPreSettlementNo(source.getPreSettlementNo()); entity.setSettlementId(null); entity.setSettlementNo(null); entity.setProjectId(source.getProjectId()); entity.setProjectName(source.getProjectName()); entity.setDeptId(source.getDeptId()); entity.setDeptName(source.getDeptName()); entity.setContractId(source.getContractId()); entity.setContractNo(source.getContractNo()); entity.setContractName(source.getContractName()); entity.setPayerName(source.getPayerName()); entity.setPayeeName(source.getPayeeName()); entity.setSettlementAmount(source.getSettlementAmount()); entity.setPayableAmount(payableOfPreSettlement(source.getId(), source.getSettlementAmount(), entity.getId())); entity.setBillType("预结算单");
 		} else {
 			entity.setProjectId(request.getProjectId()); entity.setProjectName(request.getProjectName()); entity.setDeptId(request.getDeptId()); entity.setDeptName(request.getDeptName()); entity.setContractId(request.getContractId()); entity.setContractNo(request.getContractNo()); entity.setContractName(request.getContractName()); entity.setPayerName(request.getPayerName()); entity.setPayeeName(request.getPayeeName()); entity.setSettlementAmount(request.getSettlementAmount()); entity.setPayableAmount(request.getPayableAmount()); entity.setBillType(request.getBillType());
 		}
@@ -1782,7 +1796,7 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 		BigDecimal settlementAmount = settlements.stream().map(FormalSettlement::getSettlementAmount)
 			.map(this::money).reduce(BigDecimal.ZERO, BigDecimal::add);
 		BigDecimal payableAmount = settlements.stream()
-			.map(item -> money(item.getSettlementAmount()).subtract(cumulativeFormalSettlementApplied(item.getId(), entity.getId())).max(BigDecimal.ZERO))
+			.map(item -> payableOfFormalSettlement(item.getId(), item.getSettlementAmount(), entity.getId()))
 			.reduce(BigDecimal.ZERO, BigDecimal::add);
 		if (money(entity.getAppliedAmount()).compareTo(payableAmount) > 0) throw new ServiceException("申请付款金额不能超过所选结算单可付款金额合计");
 		FormalSettlement first = settlements.get(0);
@@ -1796,15 +1810,14 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 		if (settlements.isEmpty()) return;
 		settlementRelationMapper.delete(Wrappers.<PaymentApplicationSettlement>lambdaQuery()
 			.eq(PaymentApplicationSettlement::getPaymentApplicationId, entity.getId()));
-		BigDecimal totalBase = settlements.stream().map(item -> money(item.getSettlementAmount()).subtract(
-			cumulativeFormalSettlementApplied(item.getId(), entity.getId())).max(BigDecimal.ZERO))
+		BigDecimal totalBase = settlements.stream()
+			.map(item -> payableOfFormalSettlement(item.getId(), item.getSettlementAmount(), entity.getId()))
 			.reduce(BigDecimal.ZERO, BigDecimal::add);
 		BigDecimal remainingApplied = money(entity.getAppliedAmount());
 		BigDecimal remainingPaid = money(entity.getPaidAmount());
 		for (int index = 0; index < settlements.size(); index++) {
 			FormalSettlement settlement = settlements.get(index);
-			BigDecimal base = money(settlement.getSettlementAmount()).subtract(
-				cumulativeFormalSettlementApplied(settlement.getId(), entity.getId())).max(BigDecimal.ZERO);
+			BigDecimal base = payableOfFormalSettlement(settlement.getId(), settlement.getSettlementAmount(), entity.getId());
 			BigDecimal applied = index == settlements.size() - 1 ? remainingApplied
 				: money(entity.getAppliedAmount()).multiply(base).divide(totalBase, 2, RoundingMode.DOWN);
 			BigDecimal paid = index == settlements.size() - 1 ? remainingPaid
@@ -1881,6 +1894,24 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 			.ne(excludeId != null, PaymentApplication::getId, excludeId));
 	}
 
+	/** 正式结算可付款 = 结算金额 − 已申请付款 − 项目预付核销 */
+	private BigDecimal payableOfFormalSettlement(Long settlementId, BigDecimal settlementAmount, Long excludeId) {
+		return money(settlementAmount)
+			.subtract(cumulativeFormalSettlementApplied(settlementId, excludeId))
+			.subtract(projectAdvanceWriteOffService.sumBySettlement(
+				TransportBusiConstant.SETTLEMENT_BILL_FORMAL, settlementId))
+			.max(BigDecimal.ZERO);
+	}
+
+	/** 预结算可付款 = 结算金额 − 已申请付款 − 项目预付核销 */
+	private BigDecimal payableOfPreSettlement(Long preSettlementId, BigDecimal settlementAmount, Long excludeId) {
+		return money(settlementAmount)
+			.subtract(cumulativePreSettlementApplied(preSettlementId, excludeId))
+			.subtract(projectAdvanceWriteOffService.sumBySettlement(
+				TransportBusiConstant.SETTLEMENT_BILL_PRE, preSettlementId))
+			.max(BigDecimal.ZERO);
+	}
+
 	private void fillBillLedger(PaymentApplication entity, PaymentApplicationSaveRequest request) {
 		if (!isBillPayment(request.getPaymentMethod())) {
 			entity.setBillLedgerId(null);
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PreSettlementServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PreSettlementServiceImpl.java
index a03ae549..6cc4310a 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PreSettlementServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/PreSettlementServiceImpl.java
@@ -36,6 +36,7 @@ import org.springblade.core.secure.utils.AuthUtil;
 import org.springblade.core.tool.jackson.JsonUtil;
 import org.springblade.core.tool.utils.BeanUtil;
 import org.springblade.core.tool.utils.Func;
+import org.springblade.transport.constant.TransportBusiConstant;
 import org.springblade.transport.mapper.PreSettlementAdvanceMapper;
 import org.springblade.transport.mapper.PreSettlementChangeRecordMapper;
 import org.springblade.transport.mapper.PreSettlementDetailFeeMapper;
@@ -67,6 +68,7 @@ import org.springblade.transport.service.IContractManageService;
 import org.springblade.transport.service.ICustomerArchiveService;
 import org.springblade.transport.service.IPreSettlementService;
 import org.springblade.transport.service.IProjectApplyService;
+import org.springblade.transport.service.ISettlementProjectAdvanceWriteOffService;
 import org.springblade.transport.service.IWaybillService;
 import org.springblade.transport.wrapper.PreSettlementWrapper;
 import org.springblade.system.cache.UserCache;
@@ -124,6 +126,7 @@ public class PreSettlementServiceImpl extends BaseServiceImpl<PreSettlementMappe
 	private final ICustomerArchiveService customerArchiveService;
 	private final IWaybillService waybillService;
 	private final ISysClient sysClient;
+	private final ISettlementProjectAdvanceWriteOffService projectAdvanceWriteOffService;
 
 	@Override
 	public IPage<PreSettlementVO> selectPage(IPage<PreSettlement> page, PreSettlementVO query) {
@@ -198,6 +201,8 @@ public class PreSettlementServiceImpl extends BaseServiceImpl<PreSettlementMappe
 		List<PreSettlementAdvance> advances = listAdvances(id);
 		advances.forEach(advance -> advance.setCreateUserName(UserCache.getUserRealName(advance.getCreateUser())));
 		vo.setAdvances(advances);
+		vo.setProjectAdvanceWriteOffs(projectAdvanceWriteOffService.listBySettlement(
+			TransportBusiConstant.SETTLEMENT_BILL_PRE, id));
 		vo.setChangeRecords(changeRecordMapper.selectList(Wrappers.<PreSettlementChangeRecord>lambdaQuery()
 			.eq(PreSettlementChangeRecord::getPreSettlementId, id)
 			.eq(PreSettlementChangeRecord::getIsDeleted, 0)
@@ -346,6 +351,12 @@ public class PreSettlementServiceImpl extends BaseServiceImpl<PreSettlementMappe
 		rebuildSummaryFees(settlement.getId(), true);
 		applySummaryRequest(settlement.getId(), contractChanged ? List.of() : request.getSummaryFees());
 		refreshSettlementAmount(settlement);
+		projectAdvanceWriteOffService.replaceWriteOffs(
+			TransportBusiConstant.SETTLEMENT_BILL_PRE,
+			settlement.getId(),
+			settlement.getContractId(),
+			settlement.getSettlementAmount(),
+			request.getProjectAdvanceWriteOffs());
 		if (created) {
 			saveChange(settlement.getId(), "结算单基本信息", null, "新增",
 				"新增预结算单" + settlement.getPreSettlementNo(), "");
@@ -362,6 +373,7 @@ public class PreSettlementServiceImpl extends BaseServiceImpl<PreSettlementMappe
 		}
 		releaseSourceDetails(settlement, listDetails(id));
 		deleteChildren(id);
+		projectAdvanceWriteOffService.deleteBySettlement(TransportBusiConstant.SETTLEMENT_BILL_PRE, id);
 		deleteLogic(List.of(id));
 	}
 
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/ProjectApplyServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/ProjectApplyServiceImpl.java
index d0f06ea8..64526a01 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/ProjectApplyServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/ProjectApplyServiceImpl.java
@@ -166,7 +166,7 @@ public class ProjectApplyServiceImpl extends BaseServiceImpl<ProjectApplyMapper,
 			appendProjectChangeRecord(projectApply, CHANGE_TYPE_DRAFT, null, STATUS_DRAFT, "草稿",
 				buildProjectChangeSnapshot(beforeRecord), buildProjectChangeSnapshot(projectApply));
 		}
-		return saveOrUpdate(projectApply);
+		return persistProjectApply(projectApply);
 	}
 
 	@Override
@@ -185,7 +185,7 @@ public class ProjectApplyServiceImpl extends BaseServiceImpl<ProjectApplyMapper,
 		projectApply.setApprovalStatus(STATUS_REVIEWING);
 		projectApply.setCurrentNode(resolveApprovalNode(projectApply));
 		projectApply.setCurrentProcessor("待处理");
-		return saveOrUpdate(projectApply);
+		return persistProjectApply(projectApply);
 	}
 
 	@Override
@@ -772,6 +772,8 @@ public class ProjectApplyServiceImpl extends BaseServiceImpl<ProjectApplyMapper,
 	private void validateLength(ProjectApply projectApply) {
 		TransportBusinessSupport.validateLength(projectApply.getProjectName(), 50, "项目名称不能超过50个字");
 		TransportBusinessSupport.validateLength(projectApply.getProjectShortName(), 20, "项目简称不能超过20个字");
+		TransportBusinessSupport.validateLength(projectApply.getUndertakeDeptId(), 500, "平台公司选择过多，请减少后再提交");
+		TransportBusinessSupport.validateLength(projectApply.getUndertakeDeptName(), 500, "平台公司名称过长，请减少选择后再提交");
 		TransportBusinessSupport.validateLength(projectApply.getSourceRemark(), 300, "项目由来说明不能超过300个字");
 		TransportBusinessSupport.validateLength(projectApply.getCargoQuantity(), 100, "预估货物数量不能超过100个字");
 		TransportBusinessSupport.validateLength(projectApply.getTransportRoute(), 100, "运输线路不能超过100个字");
@@ -1023,6 +1025,37 @@ public class ProjectApplyServiceImpl extends BaseServiceImpl<ProjectApplyMapper,
 		});
 	}
 
+	private boolean persistProjectApply(ProjectApply projectApply) {
+		try {
+			return saveOrUpdate(projectApply);
+		} catch (RuntimeException exception) {
+			throw translateUndertakeDeptPersistError(exception, projectApply);
+		}
+	}
+
+	/**
+	 * 多选平台公司写入失败时，提示执行字段扩容脚本（原列为 bigint / varchar(100)）。
+	 */
+	private RuntimeException translateUndertakeDeptPersistError(RuntimeException exception, ProjectApply projectApply) {
+		String message = Func.toStr(exception.getMessage());
+		Throwable cause = exception.getCause();
+		while (cause != null) {
+			message = message + " " + Func.toStr(cause.getMessage());
+			cause = cause.getCause();
+		}
+		String lowerMessage = message.toLowerCase();
+		boolean multiUndertake = Func.isNotEmpty(projectApply.getUndertakeDeptId())
+			&& (projectApply.getUndertakeDeptId().contains(",") || projectApply.getUndertakeDeptId().contains("，"));
+		boolean columnHint = lowerMessage.contains("undertake_dept")
+			|| lowerMessage.contains("incorrect integer")
+			|| lowerMessage.contains("data truncation")
+			|| lowerMessage.contains("data too long");
+		if (multiUndertake && columnHint) {
+			return new ServiceException("平台公司多选保存失败，请先执行脚本 blade_project_apply_undertake_dept_multi_20261014.sql 扩容字段后重试");
+		}
+		return exception;
+	}
+
 	private void normalizeUndertakeDept(ProjectApply projectApply) {
 		if (projectApply == null) {
 			return;
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/SettlementProjectAdvanceWriteOffServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/SettlementProjectAdvanceWriteOffServiceImpl.java
new file mode 100644
index 00000000..52e7dbc4
--- /dev/null
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/SettlementProjectAdvanceWriteOffServiceImpl.java
@@ -0,0 +1,211 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.service.impl;
+
+import com.baomidou.mybatisplus.core.toolkit.Wrappers;
+import lombok.RequiredArgsConstructor;
+import org.springblade.core.log.exception.ServiceException;
+import org.springblade.core.tool.utils.Func;
+import org.springblade.system.cache.UserCache;
+import org.springblade.transport.constant.TransportBusiConstant;
+import org.springblade.transport.mapper.PaymentApplicationMapper;
+import org.springblade.transport.mapper.SettlementProjectAdvanceWriteOffMapper;
+import org.springblade.transport.pojo.dto.SettlementProjectAdvanceWriteOffRequest;
+import org.springblade.transport.pojo.entity.PaymentApplication;
+import org.springblade.transport.pojo.entity.SettlementProjectAdvanceWriteOff;
+import org.springblade.transport.pojo.vo.ProjectAdvanceWriteOffOptionVO;
+import org.springblade.transport.service.ISettlementProjectAdvanceWriteOffService;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * 结算单项目预付核销服务实现
+ *
+ * @author Chill
+ */
+@Service
+@RequiredArgsConstructor
+public class SettlementProjectAdvanceWriteOffServiceImpl implements ISettlementProjectAdvanceWriteOffService {
+
+	private final SettlementProjectAdvanceWriteOffMapper writeOffMapper;
+	private final PaymentApplicationMapper paymentApplicationMapper;
+
+	@Override
+	public List<ProjectAdvanceWriteOffOptionVO> listOptions(Long contractId, String excludeSettlementType,
+															Long excludeSettlementId) {
+		if (contractId == null) {
+			throw new ServiceException("请先选择合同");
+		}
+		List<PaymentApplication> applications = paymentApplicationMapper.selectList(
+			Wrappers.<PaymentApplication>lambdaQuery()
+				.eq(PaymentApplication::getContractId, contractId)
+				.eq(PaymentApplication::getPaymentType, TransportBusiConstant.PAYMENT_TYPE_PROJECT_ADVANCE)
+				.eq(PaymentApplication::getApprovalStatus, TransportBusiConstant.APPROVED)
+				.eq(PaymentApplication::getIsDeleted, 0)
+				.orderByDesc(PaymentApplication::getCreateTime));
+		List<ProjectAdvanceWriteOffOptionVO> options = new ArrayList<>();
+		for (PaymentApplication application : applications) {
+			BigDecimal projectAdvanceAmount = money(application.getAppliedAmount());
+			BigDecimal usedAmount = money(writeOffMapper.sumWriteOffByPaymentApplication(
+				application.getId(), excludeSettlementType, excludeSettlementId));
+			BigDecimal availableAmount = projectAdvanceAmount.subtract(usedAmount).max(BigDecimal.ZERO);
+			if (availableAmount.compareTo(BigDecimal.ZERO) <= 0) {
+				continue;
+			}
+			ProjectAdvanceWriteOffOptionVO option = new ProjectAdvanceWriteOffOptionVO();
+			option.setPaymentApplicationId(application.getId());
+			option.setPaymentNo(application.getPaymentNo());
+			option.setProjectAdvanceAmount(projectAdvanceAmount);
+			option.setAvailableWriteOffAmount(availableAmount);
+			option.setKingdeeBillNo(application.getKingdeeBillNo());
+			option.setCreateUserName(UserCache.getUserRealName(application.getCreateUser()));
+			option.setCreateTime(application.getCreateTime());
+			options.add(option);
+		}
+		return options;
+	}
+
+	@Override
+	public List<SettlementProjectAdvanceWriteOff> listBySettlement(String settlementType, Long settlementId) {
+		if (Func.isEmpty(settlementType) || settlementId == null) {
+			return List.of();
+		}
+		List<SettlementProjectAdvanceWriteOff> rows = writeOffMapper.selectList(
+			Wrappers.<SettlementProjectAdvanceWriteOff>lambdaQuery()
+				.eq(SettlementProjectAdvanceWriteOff::getSettlementType, settlementType)
+				.eq(SettlementProjectAdvanceWriteOff::getSettlementId, settlementId)
+				.eq(SettlementProjectAdvanceWriteOff::getIsDeleted, 0)
+				.orderByAsc(SettlementProjectAdvanceWriteOff::getCreateTime)
+				.orderByAsc(SettlementProjectAdvanceWriteOff::getId));
+		for (SettlementProjectAdvanceWriteOff row : rows) {
+			PaymentApplication application = paymentApplicationMapper.selectById(row.getPaymentApplicationId());
+			BigDecimal projectAdvanceAmount = application == null
+				? money(row.getProjectAdvanceAmount()) : money(application.getAppliedAmount());
+			BigDecimal usedAmount = money(writeOffMapper.sumWriteOffByPaymentApplication(
+				row.getPaymentApplicationId(), settlementType, settlementId));
+			row.setProjectAdvanceAmount(projectAdvanceAmount);
+			row.setAvailableWriteOffAmount(projectAdvanceAmount.subtract(usedAmount).max(BigDecimal.ZERO));
+			if (application != null) {
+				row.setPaymentNo(application.getPaymentNo());
+				row.setKingdeeBillNo(application.getKingdeeBillNo());
+				row.setCreateUserName(UserCache.getUserRealName(application.getCreateUser()));
+				row.setPaymentCreateTime(application.getCreateTime());
+			} else {
+				row.setCreateUserName(UserCache.getUserRealName(row.getCreateUser()));
+				row.setPaymentCreateTime(row.getCreateTime());
+			}
+		}
+		return rows;
+	}
+
+	@Override
+	public BigDecimal sumBySettlement(String settlementType, Long settlementId) {
+		if (Func.isEmpty(settlementType) || settlementId == null) {
+			return BigDecimal.ZERO.setScale(2, RoundingMode.HALF_UP);
+		}
+		return money(writeOffMapper.sumWriteOffBySettlement(settlementType, settlementId));
+	}
+
+	@Override
+	@Transactional(rollbackFor = Exception.class)
+	public void replaceWriteOffs(String settlementType, Long settlementId, Long contractId,
+								 BigDecimal settlementAmount, List<SettlementProjectAdvanceWriteOffRequest> writeOffs) {
+		if (Func.isEmpty(settlementType) || settlementId == null) {
+			throw new ServiceException("结算单不能为空");
+		}
+		if (contractId == null) {
+			throw new ServiceException("合同不能为空");
+		}
+		List<SettlementProjectAdvanceWriteOffRequest> requestRows = writeOffs == null ? List.of() : writeOffs;
+		BigDecimal settlementLimit = money(settlementAmount);
+		BigDecimal totalWriteOff = BigDecimal.ZERO;
+		Set<Long> paymentIds = new HashSet<>();
+		List<SettlementProjectAdvanceWriteOff> entities = new ArrayList<>();
+		for (SettlementProjectAdvanceWriteOffRequest request : requestRows) {
+			if (request == null || request.getPaymentApplicationId() == null) {
+				throw new ServiceException("请选择项目预付单");
+			}
+			if (!paymentIds.add(request.getPaymentApplicationId())) {
+				throw new ServiceException("同一项目预付单不可重复核销");
+			}
+			BigDecimal writeOffAmount = money(request.getWriteOffAmount());
+			if (writeOffAmount.compareTo(BigDecimal.ZERO) <= 0) {
+				throw new ServiceException("本次核销金额必须大于0");
+			}
+			PaymentApplication application = paymentApplicationMapper.selectById(request.getPaymentApplicationId());
+			if (application == null || Objects.equals(application.getIsDeleted(), 1)) {
+				throw new ServiceException("项目预付单不存在");
+			}
+			if (!TransportBusiConstant.PAYMENT_TYPE_PROJECT_ADVANCE.equals(application.getPaymentType())) {
+				throw new ServiceException("仅可核销项目预付单");
+			}
+			if (!TransportBusiConstant.APPROVED.equals(application.getApprovalStatus())) {
+				throw new ServiceException("仅可选择审核通过的项目预付单");
+			}
+			if (!Objects.equals(contractId, application.getContractId())) {
+				throw new ServiceException("项目预付单与结算单合同不一致");
+			}
+			BigDecimal projectAdvanceAmount = money(application.getAppliedAmount());
+			BigDecimal usedAmount = money(writeOffMapper.sumWriteOffByPaymentApplication(
+				application.getId(), settlementType, settlementId));
+			BigDecimal availableAmount = projectAdvanceAmount.subtract(usedAmount).max(BigDecimal.ZERO);
+			if (writeOffAmount.compareTo(availableAmount) > 0) {
+				throw new ServiceException("预付单" + Func.toStr(application.getPaymentNo(), "")
+					+ "本次核销金额不能超过可核销金额");
+			}
+			totalWriteOff = totalWriteOff.add(writeOffAmount);
+			SettlementProjectAdvanceWriteOff entity = new SettlementProjectAdvanceWriteOff();
+			entity.setSettlementType(settlementType);
+			entity.setSettlementId(settlementId);
+			entity.setPaymentApplicationId(application.getId());
+			entity.setPaymentNo(application.getPaymentNo());
+			entity.setProjectAdvanceAmount(projectAdvanceAmount);
+			entity.setWriteOffAmount(writeOffAmount);
+			entity.setKingdeeBillNo(application.getKingdeeBillNo());
+			entity.setStatus(1);
+			entity.setIsDeleted(0);
+			entities.add(entity);
+		}
+		if (totalWriteOff.compareTo(settlementLimit) > 0) {
+			throw new ServiceException("项目预付核销合计不能超过结算单金额");
+		}
+		writeOffMapper.delete(Wrappers.<SettlementProjectAdvanceWriteOff>lambdaQuery()
+			.eq(SettlementProjectAdvanceWriteOff::getSettlementType, settlementType)
+			.eq(SettlementProjectAdvanceWriteOff::getSettlementId, settlementId));
+		for (SettlementProjectAdvanceWriteOff entity : entities) {
+			writeOffMapper.insert(entity);
+		}
+	}
+
+	@Override
+	@Transactional(rollbackFor = Exception.class)
+	public void deleteBySettlement(String settlementType, Long settlementId) {
+		if (Func.isEmpty(settlementType) || settlementId == null) {
+			return;
+		}
+		writeOffMapper.delete(Wrappers.<SettlementProjectAdvanceWriteOff>lambdaQuery()
+			.eq(SettlementProjectAdvanceWriteOff::getSettlementType, settlementType)
+			.eq(SettlementProjectAdvanceWriteOff::getSettlementId, settlementId));
+	}
+
+	private BigDecimal money(BigDecimal value) {
+		return value == null ? BigDecimal.ZERO.setScale(2, RoundingMode.HALF_UP)
+			: value.setScale(2, RoundingMode.HALF_UP);
+	}
+
+}
diff --git a/doc/sql/transport/blade_project_apply_undertake_dept_multi_20261014.sql b/doc/sql/transport/blade_project_apply_undertake_dept_multi_20261014.sql
index b2d5d222..2b96a193 100644
--- a/doc/sql/transport/blade_project_apply_undertake_dept_multi_20261014.sql
+++ b/doc/sql/transport/blade_project_apply_undertake_dept_multi_20261014.sql
@@ -1,4 +1,64 @@
--- 平台公司支持多选：ID 逗号分隔，名称顿号分隔
-ALTER TABLE `blade_project_apply`
-  MODIFY COLUMN `undertake_dept_id` varchar(500) DEFAULT NULL COMMENT '平台公司ID，多个逗号分隔',
-  MODIFY COLUMN `undertake_dept_name` varchar(500) DEFAULT NULL COMMENT '平台公司，多个顿号分隔';
+-- 项目立项平台公司多选：ID 逗号分隔，名称顿号分隔
+-- 原字段：undertake_dept_id bigint、undertake_dept_name varchar(100)
+-- 选择 2 个及以上平台公司时，若未扩容会报 Incorrect integer value / Data truncation
+-- 整列索引挂在 varchar(500) 上可能因键长超限导致 ALTER 失败，故先删索引再改前缀索引
+
+DELIMITER $$
+
+DROP PROCEDURE IF EXISTS `upgrade_project_apply_undertake_dept_multi_20261014`$$
+CREATE PROCEDURE `upgrade_project_apply_undertake_dept_multi_20261014`()
+BEGIN
+  DECLARE db_name varchar(128);
+  DECLARE need_modify tinyint DEFAULT 0;
+  SET db_name = DATABASE();
+
+  IF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = db_name
+      AND table_name = 'blade_project_apply'
+      AND column_name = 'undertake_dept_id'
+      AND (
+        data_type IN ('bigint', 'int', 'integer')
+        OR (data_type IN ('varchar', 'char') AND IFNULL(character_maximum_length, 0) < 500)
+      )
+  ) OR EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_schema = db_name
+      AND table_name = 'blade_project_apply'
+      AND column_name = 'undertake_dept_name'
+      AND data_type IN ('varchar', 'char')
+      AND IFNULL(character_maximum_length, 0) < 500
+  ) THEN
+    SET need_modify = 1;
+  END IF;
+
+  IF need_modify = 1 THEN
+    IF EXISTS (
+      SELECT 1 FROM information_schema.statistics
+      WHERE table_schema = db_name
+        AND table_name = 'blade_project_apply'
+        AND index_name = 'idx_project_apply_dept'
+    ) THEN
+      ALTER TABLE `blade_project_apply` DROP INDEX `idx_project_apply_dept`;
+    END IF;
+
+    ALTER TABLE `blade_project_apply`
+      MODIFY COLUMN `undertake_dept_id` varchar(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '平台公司ID，多个逗号分隔',
+      MODIFY COLUMN `undertake_dept_name` varchar(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '平台公司，多个顿号分隔';
+  END IF;
+
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.statistics
+    WHERE table_schema = db_name
+      AND table_name = 'blade_project_apply'
+      AND index_name = 'idx_project_apply_dept'
+  ) THEN
+    ALTER TABLE `blade_project_apply`
+      ADD INDEX `idx_project_apply_dept` (`undertake_dept_id`(191)) USING BTREE;
+  END IF;
+END$$
+
+CALL `upgrade_project_apply_undertake_dept_multi_20261014`()$$
+DROP PROCEDURE `upgrade_project_apply_undertake_dept_multi_20261014`$$
+
+DELIMITER ;
diff --git a/doc/sql/transport/blade_project_contract_management.sql b/doc/sql/transport/blade_project_contract_management.sql
index 59890b1b..62a9ecd2 100644
--- a/doc/sql/transport/blade_project_contract_management.sql
+++ b/doc/sql/transport/blade_project_contract_management.sql
@@ -60,7 +60,7 @@ CREATE TABLE `blade_project_apply` (
   `void_reason` varchar(500) DEFAULT NULL COMMENT '作废原因',
   PRIMARY KEY (`id`) USING BTREE,
   UNIQUE KEY `uk_project_apply_name` (`project_name`, `is_deleted`) USING BTREE,
-  KEY `idx_project_apply_dept` (`undertake_dept_id`) USING BTREE,
+  KEY `idx_project_apply_dept` (`undertake_dept_id`(191)) USING BTREE,
   KEY `idx_project_apply_status` (`approval_status`) USING BTREE,
   KEY `idx_project_apply_create_time` (`create_time`) USING BTREE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='项目立项';
@@ -80,8 +80,8 @@ CREATE TABLE `blade_temporary_credit_limit` (
   `project_id` bigint(20) DEFAULT NULL COMMENT '项目ID',
   `project_code` varchar(100) DEFAULT NULL COMMENT '项目编号',
   `project_name` varchar(100) DEFAULT NULL COMMENT '项目名称',
-  `undertake_dept_id` varchar(500) DEFAULT NULL COMMENT '平台公司ID，多个逗号分隔',
-  `undertake_dept_name` varchar(500) DEFAULT NULL COMMENT '平台公司，多个顿号分隔',
+  `undertake_dept_id` bigint(20) DEFAULT NULL COMMENT '承办部门ID',
+  `undertake_dept_name` varchar(100) DEFAULT NULL COMMENT '承办部门',
   `project_fund_limit` decimal(18,2) DEFAULT NULL COMMENT '项目资金使用额度(万元)',
   `used_fund_limit` decimal(18,2) DEFAULT NULL COMMENT '已使用项目资金额度(万元)',
   `remaining_fund_limit` decimal(18,2) DEFAULT NULL COMMENT '剩余项目资金使用额度(万元)',
diff --git a/doc/sql/transport/blade_settlement_project_advance_write_off_20261016.sql b/doc/sql/transport/blade_settlement_project_advance_write_off_20261016.sql
new file mode 100644
index 00000000..7aba7877
--- /dev/null
+++ b/doc/sql/transport/blade_settlement_project_advance_write_off_20261016.sql
@@ -0,0 +1,23 @@
+-- 结算单项目预付核销明细
+CREATE TABLE IF NOT EXISTS `blade_settlement_project_advance_write_off` (
+  `id` bigint NOT NULL COMMENT '主键',
+  `tenant_id` varchar(12) NOT NULL DEFAULT '000000' COMMENT '租户ID',
+  `settlement_type` varchar(20) NOT NULL COMMENT '结算单类型 pre/formal',
+  `settlement_id` bigint NOT NULL COMMENT '预结算/正式结算单ID',
+  `payment_application_id` bigint NOT NULL COMMENT '项目预付付款申请ID',
+  `payment_no` varchar(64) DEFAULT NULL COMMENT '预付单号',
+  `project_advance_amount` decimal(18,2) DEFAULT 0.00 COMMENT '项目预付金额',
+  `write_off_amount` decimal(18,2) NOT NULL DEFAULT 0.00 COMMENT '本次核销金额',
+  `kingdee_bill_no` varchar(100) DEFAULT NULL COMMENT '金蝶预付单号',
+  `create_user` bigint DEFAULT NULL COMMENT '创建人',
+  `create_dept` bigint DEFAULT NULL COMMENT '创建部门',
+  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
+  `update_user` bigint DEFAULT NULL COMMENT '更新人',
+  `update_time` datetime DEFAULT NULL COMMENT '更新时间',
+  `status` int DEFAULT 1 COMMENT '业务状态',
+  `is_deleted` int DEFAULT 0 COMMENT '是否已删除',
+  PRIMARY KEY (`id`),
+  KEY `idx_spa_write_off_settlement` (`settlement_type`,`settlement_id`),
+  KEY `idx_spa_write_off_payment` (`payment_application_id`),
+  KEY `idx_spa_write_off_create_time` (`create_time`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT='结算单项目预付核销';