diff --git a/so/src/private/nccloud/api/impl/so/m30/APISaleOrderMaitainImpl.java b/so/src/private/nccloud/api/impl/so/m30/APISaleOrderMaitainImpl.java
index ff19762..4961923 100644
--- a/so/src/private/nccloud/api/impl/so/m30/APISaleOrderMaitainImpl.java
+++ b/so/src/private/nccloud/api/impl/so/m30/APISaleOrderMaitainImpl.java
@@ -719,10 +719,14 @@ public class APISaleOrderMaitainImpl implements IAPISaleOrderMaitain {
 
 
                     targetBVO.setVbdef18(sourceBVO.getVbdef18());  // 是否定制
-                    targetBVO.setVbdef19(sourceBVO.getVbdef19());  // 计划开工日期
-                    targetBVO.setVbdef20(sourceBVO.getVbdef20());  // 计划完工日期
                     targetBVO.setVbdef14(sourceBVO.getVbdef14());  // 合同销售订单变更明细id
                     targetBVO.setCrowno(sourceBVO.getCrowno());  // 行号
+                    if (StringUtils.isNotEmpty(sourceBVO.getVbdef19())) {
+                        targetBVO.setVbdef19(sourceBVO.getVbdef19());  // 计划开工日期
+                    }
+                    if (StringUtils.isNotEmpty(sourceBVO.getVbdef20())) {
+                        targetBVO.setVbdef20(sourceBVO.getVbdef20());  // 计划完工日期
+                    }
 
                 }