diff --git a/src/WMS.Web.Domain/Services/SerialNumberService.cs b/src/WMS.Web.Domain/Services/SerialNumberService.cs
index 3b2f6f5d..4fa5cb59 100644
--- a/src/WMS.Web.Domain/Services/SerialNumberService.cs
+++ b/src/WMS.Web.Domain/Services/SerialNumberService.cs
@@ -382,9 +382,9 @@ namespace WMS.Web.Domain.Services
                 var box = boxList.FirstOrDefault(f => f.Id == entity.BoxId);
                 var detail = backRecord.Details.FirstOrDefault(w => w.SerialNumbers.Contains(entity.SerialNumber));
 
-                if (backRecord.Type == BackRecordType.InstockOff)
-                    entity.UnBind();
-                else
+                //if (backRecord.Type == BackRecordType.InstockOff)
+                //    entity.UnBind();
+                if (backRecord.Type == BackRecordType.OutstockOn)
                     entity.Bind(detail.BoxId);