执行退货任务是，采购订单号空时不修改采购订单数量。

win-module-wms/win-module-wms-biz/src/main/java/com/win/module/wms/service/purchasereturnJob/PurchasereturnJobMainServiceImpl.java

@@ -264,7 +264,9 @@ public class PurchasereturnJobMainServiceImpl implements PurchasereturnJobMainSe
             purchasereturnRecordDetailDO.setId(null).setCreator(null).setCreateTime(null).setUpdater(null).setUpdateTime(null);
             purchasereturnRecordDetailDOList.add(purchasereturnRecordDetailDO);
             //更新采购订单明细的退货数量
-            purchaseMainService.updateOrderPurchaseReturnQty(purchasereturnRecordDetailDO.getPoNumber(), purchasereturnRecordDetailDO.getPoLine(), purchasereturnRecordDetailDO.getItemCode(), purchasereturnRecordDetailDO.getQty());
+            if(purchasereturnRecordDetailDO.getPoNumber() != null && !purchasereturnRecordDetailDO.getPoNumber().isEmpty()) {
+                purchaseMainService.updateOrderPurchaseReturnQty(purchasereturnRecordDetailDO.getPoNumber(), purchasereturnRecordDetailDO.getPoLine(), purchasereturnRecordDetailDO.getItemCode(), purchasereturnRecordDetailDO.getQty());
+            }
             //查询库存余额
             BalanceDO balanceDO = balanceMapper.getBalanceQty(purchasereturnRecordDetailDO.getFromPackingNumber(), purchasereturnRecordDetailDO.getItemCode(), purchasereturnRecordDetailDO.getFromBatch(), purchasereturnRecordDetailDO.getInventoryStatus(), purchasereturnRecordDetailDO.getFromLocationCode());
             if(balanceDO == null) {