fix(wms):total_volume，total_area字段可为空

mhd_wms/src/main/java/com/mhd/wms/domain/receiptMaterialDetail/repository/persistence/ReceiptMaterialDetailImpl.java

@@ -492,6 +492,8 @@ public class ReceiptMaterialDetailImpl extends ServiceImpl<ReceiptMaterialDetail
         }
         //保存物料明细信息
         saveOrUpdateBatch(receiptMaterialDetailList);
+        // total_volume/total_area 为空时强制落库 NULL（绕开 MyBatis-Plus NOT_NULL 更新策略）
+        applyForcedNullTotalMetrics(receiptMaterialDetailList);
         //批量新增/更新物料更多属性：保留已有值，仅更新有值的属性，不再先删后插
         mergeMaterialMoreDetail(materialMoreDetailList, stockReceiptOrderDO, receiptMaterialDetailDOList);
         //批量新增/更新物料更多属性：先删除该收货单下所有明细的旧批次属性，再插入新值，避免重复插入导致更新失效
@@ -657,6 +659,49 @@ public class ReceiptMaterialDetailImpl extends ServiceImpl<ReceiptMaterialDetail
         return val != null && val.compareTo(BigDecimal.ZERO) == 0;
     }
 
+    /**
+     * total_volume / total_area 为空时强制 UPDATE 置 NULL。
+     * 仅对已存在明细（material_detail_id 非空）生效；新插入行由实体空值自然得到 null。
+     */
+    private void applyForcedNullTotalMetrics(List<ReceiptMaterialDetail> receiptMaterialDetailList) {
+        if (CollectionUtils.isEmpty(receiptMaterialDetailList)) {
+            return;
+        }
+        // 列名组合 -> materialDetailId 列表（total_volume / total_area / 两者）
+        Map<String, List<Long>> columnsToIds = new HashMap<>();
+        for (ReceiptMaterialDetail detail : receiptMaterialDetailList) {
+            if (detail == null || detail.getMaterialDetailId() == null) {
+                continue;
+            }
+            StringBuilder columns = new StringBuilder();
+            if (detail.getTotalVolume() == null) {
+                columns.append("total_volume");
+            }
+            if (detail.getTotalArea() == null) {
+                if (columns.length() > 0) {
+                    columns.append(",");
+                }
+                columns.append("total_area");
+            }
+            if (columns.length() == 0) {
+                continue;
+            }
+            columnsToIds.computeIfAbsent(columns.toString(), k -> new ArrayList<>())
+                    .add(detail.getMaterialDetailId());
+        }
+        if (columnsToIds.isEmpty()) {
+            return;
+        }
+        for (Map.Entry<String, List<Long>> entry : columnsToIds.entrySet()) {
+            UpdateWrapper<ReceiptMaterialDetail> wrapper = new UpdateWrapper<>();
+            for (String column : entry.getKey().split(",")) {
+                wrapper.set(column, null);
+            }
+            wrapper.in("material_detail_id", entry.getValue());
+            receiptMaterialDetailMapper.update(null, wrapper);
+        }
+    }
+
     private void setMore(ReceiptMaterialDetailDO receiptMaterialDetailDO) {
         List<MaterialMoreDetailDO> materialMoreDetailList = receiptMaterialDetailDO.getMaterialMoreDetailList();
         if (!CollectionUtils.isEmpty(materialMoreDetailList)) {