diff --git a/BWP.B3_YunKen/BLActions/CusAcceptUpdateAcceptInfoBLAction.cs b/BWP.B3_YunKen/BLActions/CusAcceptUpdateAcceptInfoBLAction.cs
index a64bddb..fe5d759 100644
--- a/BWP.B3_YunKen/BLActions/CusAcceptUpdateAcceptInfoBLAction.cs
+++ b/BWP.B3_YunKen/BLActions/CusAcceptUpdateAcceptInfoBLAction.cs
@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
+using BWP.B3Frameworks.BO.NamedValueTemplate;
 using BWP.B3Sale.BL;
 using BWP.B3Sale.BO;
 using Forks.EnterpriseServices.BusinessInterfaces;
@@ -38,6 +39,8 @@ namespace BWP.B3_YunKen.BLActions
           isNew = true;
         }
         accDetail.AlreadyAcceptNumber = (accDetail.AlreadyAcceptNumber ?? 0) - (detail.AcceptNum ?? 0);
+        if (accDetail.AlreadyAcceptNumber < 0)
+          return;
         accDetail.AlreadyAcceptUnitNum = (accDetail.AlreadyAcceptUnitNum ?? 0) - (detail.AcceptNum ?? 0);
         accDetail.AlreadyAcceptSecondNumber = (accDetail.AlreadyAcceptSecondNumber ?? 0) - (detail.AcceptSecondNumber ?? 0);
         if (isNew)