diff --git a/src/main/java/com/xujie/sys/modules/ecss/service/impl/CoDelExcelServiceImpl.java b/src/main/java/com/xujie/sys/modules/ecss/service/impl/CoDelExcelServiceImpl.java
index e7d3d511..2089daaf 100644
--- a/src/main/java/com/xujie/sys/modules/ecss/service/impl/CoDelExcelServiceImpl.java
+++ b/src/main/java/com/xujie/sys/modules/ecss/service/impl/CoDelExcelServiceImpl.java
@@ -1175,64 +1175,64 @@ public class CoDelExcelServiceImpl implements CoDelExcelService {
         // 先删除全部明细，再新建明细
         coDelMapper.deleteAllEcssDelDetail(headerData);
 
-        // 智能判断改单逻辑：按PN分组汇总数量，避免因顺序变化导致误判
-        // 构建原数据Map：按PN分组，计算每个PN的总数量
-        Map<String, BigDecimal> originalPnQtyMap = new HashMap<>();
-        for (EcssCoDelNotifyDetailData detail : dbData) {
-            String pn = detail.getPn();
-            BigDecimal qty = detail.getQty();
-            originalPnQtyMap.put(pn, originalPnQtyMap.getOrDefault(pn, BigDecimal.ZERO).add(qty));
-        }
-
-        // 构建新数据Map：按PN分组，计算每个PN的总数量
-        Map<String, BigDecimal> newPnQtyMap = new HashMap<>();
-        for (EcssCoDelNotifyData excelData : excelList) {
-            String pn = excelData.getPn();
-            BigDecimal qty = excelData.getQty();
-            newPnQtyMap.put(pn, newPnQtyMap.getOrDefault(pn, BigDecimal.ZERO).add(qty));
-        }
+        // 改单判断逻辑：按itemNo逐行比较，避免同PN多行时按总数量比较漏判
+        Map<Integer, EcssCoDelNotifyDetailData> originalDetailMap = dbData.stream()
+                .collect(Collectors.toMap(EcssCoDelNotifyDetail::getItemNo, detail -> detail, (v1, v2) -> v1));
+        Set<Integer> newItemNoSet = new HashSet<>();
 
-        // 设置itemNo并判断每一行是否有变化（智能判断：按PN比较总数量）
+        // 设置itemNo并判断每一行是否有变化（按itemNo一对一比较PN/数量）
         for (int i = 0; i < excelList.size(); i++) {
-            excelList.get(i).setDelNo(headerData.getDelNo());
-            excelList.get(i).setItemNo(i + 1);
+            EcssCoDelNotifyData excelData = excelList.get(i);
+            Integer itemNo = i + 1;
+            excelData.setDelNo(headerData.getDelNo());
+            excelData.setItemNo(itemNo);
+            newItemNoSet.add(itemNo);
 
-            String pn = excelList.get(i).getPn();
-            BigDecimal originalTotalQty = originalPnQtyMap.get(pn);
-            BigDecimal newTotalQty = newPnQtyMap.get(pn);
+            EcssCoDelNotifyDetailData originalDetail = originalDetailMap.get(itemNo);
 
-            // 判断是否有修改（按PN比较总数量，避免因顺序变化误判）
             boolean isModified = false;
             boolean isQtyModified = false;
 
-            if (originalTotalQty == null) {
-                // 新增PN：原数据中不存在该PN
-                isModified = true;
-                isQtyModified = true;
-                log.info("检测到新增PN: {}, 数量: {}", pn, newTotalQty);
-            } else if (originalTotalQty.compareTo(newTotalQty) != 0) {
-                // 数量变更：PN存在但总数量不同
+            if (originalDetail == null) {
+                // 新增行：原数据不存在该itemNo
                 isModified = true;
                 isQtyModified = true;
-                log.info("检测到PN数量变更: {}, 原数量: {}, 新数量: {}", pn, originalTotalQty, newTotalQty);
+                BigDecimal newQty = excelData.getQty() != null ? excelData.getQty() : BigDecimal.ZERO;
+                log.info("检测到新增明细行: itemNo={}, PN={}, 数量={}", itemNo, excelData.getPn(), newQty);
+            } else {
+                String originalPn = originalDetail.getPn();
+                String newPn = excelData.getPn();
+                BigDecimal originalQty = originalDetail.getQty() != null ? originalDetail.getQty() : BigDecimal.ZERO;
+                BigDecimal newQty = excelData.getQty() != null ? excelData.getQty() : BigDecimal.ZERO;
+
+                boolean pnChanged = !Objects.equals(originalPn, newPn);
+                boolean qtyChanged = originalQty.compareTo(newQty) != 0;
+                if (pnChanged || qtyChanged) {
+                    isModified = true;
+                    isQtyModified = true;
+                    log.info("检测到明细行变更: itemNo={}, 原PN={}, 新PN={}, 原数量={}, 新数量={}",
+                            itemNo, originalPn, newPn, originalQty, newQty);
+                }
             }
-            // 其他情况：PN和总数量都相同，无变化，isModified保持false
 
             // 只有真正有变化的才标记modifyFlag=true
-            excelList.get(i).setModifyFlag(isModified);
-
-            // 设置数量变化标记
-            if (isQtyModified) {
-                excelList.get(i).setModifyQtyFlag(true);
-            }
+            excelData.setModifyFlag(isModified);
+            // 仅PN/数量变化时标记modifyQtyFlag=true
+            excelData.setModifyQtyFlag(isQtyModified);
         }
 
-        // 检查是否有PN被删除（在原数据中存在但新数据中不存在）
-        boolean hasPnDeleted = false;
-        for (String originalPn : originalPnQtyMap.keySet()) {
-            if (!newPnQtyMap.containsKey(originalPn)) {
-                log.info("检测到PN被删除: {}, 原数量: {}", originalPn, originalPnQtyMap.get(originalPn));
-                hasPnDeleted = true;
+        // 检查是否有明细行被删除（原itemNo存在但新数据中不存在）
+        boolean hasDetailDeleted = false;
+        for (Integer originalItemNo : originalDetailMap.keySet()) {
+            if (!newItemNoSet.contains(originalItemNo)) {
+                EcssCoDelNotifyDetailData deletedDetail = originalDetailMap.get(originalItemNo);
+                BigDecimal deletedQty = deletedDetail != null && deletedDetail.getQty() != null
+                        ? deletedDetail.getQty() : BigDecimal.ZERO;
+                log.info("检测到明细行被删除: itemNo={}, PN={}, 原数量={}",
+                        originalItemNo,
+                        deletedDetail != null ? deletedDetail.getPn() : "-",
+                        deletedQty);
+                hasDetailDeleted = true;
             }
         }
 
@@ -1268,9 +1268,9 @@ public class CoDelExcelServiceImpl implements CoDelExcelService {
         }
 
         // 改单导入后的状态处理逻辑
-        // 只有在修改了PN/Qty或删除了PN时才执行状态处理
-        if (hasPnOrQtyModified || hasPnDeleted) {
-            log.info("检测到PN/Qty修改或PN删除，执行状态处理逻辑");
+        // 只有在修改了PN/Qty或删除了明细行时才执行状态处理
+        if (hasPnOrQtyModified || hasDetailDeleted) {
+            log.info("检测到PN/Qty修改或明细行删除，执行状态处理逻辑");
             handleNotifyStatusAfterModify(headerData, true);
         } else {
             log.info("仅修改了其他字段(Destination、Shipping Mode、Currency、TP等)，执行状态处理逻辑但不删除托盘数据");