diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/PaymentApplicationMapper.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/PaymentApplicationMapper.java
index 770dc202..2f8af3b1 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/PaymentApplicationMapper.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/PaymentApplicationMapper.java
@@ -21,9 +21,23 @@ 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.apache.ibatis.annotations.Select;
 import org.springblade.transport.pojo.entity.PaymentApplication;
 
+import java.util.List;
+
 /** 付款申请 Mapper。 @author Chill */
 @Mapper
 public interface PaymentApplicationMapper extends BaseMapper<PaymentApplication> {
+
+	/**
+	 * 按前缀查询单号（含逻辑删除单据）：发号占位用，删除后的单号不复用，
+	 * 避免 A103-3/A103-1 推送时防重键（awrp_src_code）撞金蝶已有单据（已提交单据不允许修改）。
+	 *
+	 * @param pattern 单号匹配模式（如 'FKD20261018%'）
+	 */
+	@Select("SELECT payment_no FROM blade_payment_application WHERE payment_no LIKE #{pattern}")
+	List<String> selectPaymentNosIncludingDeleted(@Param("pattern") String pattern);
+
 }
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 f8860776..4b387c48 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
@@ -1040,6 +1040,13 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 		if (existPayApply == null || existPayApply.getId() == null) {
 			return null;
 		}
+		// 防重键冲突防线：同号但金额不一致，说明金蝶单据并非本单（多为已删除付款申请复用单号残留），禁止错绑
+		if (existPayApply.getApplyamount() != null
+			&& money(existPayApply.getApplyamount()).compareTo(money(entity.getAppliedAmount())) != 0) {
+			throw new ServiceException("付款申请[" + entity.getPaymentNo() + "]勾稽异常：金蝶已存在同号付款申请单"
+				+ "（金额" + existPayApply.getApplyamount() + "与本单" + money(entity.getAppliedAmount())
+				+ "不一致，疑似单号复用残留），请财务在金蝶核实作废/删除后重推");
+		}
 		String kingdeeBillId = String.valueOf(existPayApply.getId());
 		if (Func.isNotEmpty(existPayApply.getBillno())) {
 			entity.setKingdeeBillNo(existPayApply.getBillno());
@@ -2265,7 +2272,17 @@ public class PaymentApplicationServiceImpl extends BaseServiceImpl<PaymentApplic
 	}
 	private PaymentApplication existing(Long id) { PaymentApplication entity = getById(id); if (entity == null || Objects.equals(entity.getIsDeleted(), 1)) throw new ServiceException("付款申请不存在"); return entity; }
 	private PaymentApplication editable(Long id) { PaymentApplication entity = existing(id); if (!List.of(TransportBusiConstant.DRAFT, TransportBusiConstant.RETURNED).contains(entity.getApprovalStatus())) throw new ServiceException("当前状态不可编辑"); return entity; }
-	private String nextNo() { String prefix = "FKD" + LocalDate.now().format(DateTimeFormatter.BASIC_ISO_DATE); return prefix + String.format("%05d", count(Wrappers.<PaymentApplication>lambdaQuery().likeRight(PaymentApplication::getPaymentNo, prefix)) + 1); }
+	private String nextNo() {
+		String prefix = "FKD" + LocalDate.now().format(DateTimeFormatter.BASIC_ISO_DATE);
+		// 单号占用含逻辑删除单据：删除后不复用单号，避免推送时防重键撞金蝶已有单据（已提交单据不允许修改）
+		int max = this.baseMapper.selectPaymentNosIncludingDeleted(prefix + "%").stream()
+			.map(no -> no.length() > prefix.length() ? no.substring(prefix.length()) : "")
+			.filter(no -> no.matches("\\d+"))
+			.map(Integer::valueOf)
+			.max(Integer::compareTo)
+			.orElse(0);
+		return prefix + String.format("%05d", max + 1);
+	}
 	private BigDecimal nonNegative(BigDecimal value, String name) { if (value == null || value.compareTo(BigDecimal.ZERO) < 0) throw new ServiceException(name + "不能小于0"); return value; }
 	private BigDecimal money(BigDecimal value) { return value == null ? BigDecimal.ZERO : value; }
 	private String limit(String value, int length) { if (value != null && value.length() > length) throw new ServiceException("备注不能超过" + length + "个字符"); return value; }