diff --git a/server/AyaNova/biz/WorkOrderBiz.cs b/server/AyaNova/biz/WorkOrderBiz.cs
index e6e63bf1..bf1b8cfe 100644
--- a/server/AyaNova/biz/WorkOrderBiz.cs
+++ b/server/AyaNova/biz/WorkOrderBiz.cs
@@ -136,7 +136,7 @@ namespace AyaNova.Biz
             CopyObject.Copy(dtPutObject, dbObject, "Id,Serial");
 
             //if user has rights then change it, otherwise just ignore it and do the rest
-            if (SnapshotOfOriginalDBObj.Serial != dtPutObject.Serial && Authorized.HasAnyRole(CurrentUserRoles, RolesAllowedToChangeSerial))
+            if (dtPutObject.Serial != 0 && SnapshotOfOriginalDBObj.Serial != dtPutObject.Serial && Authorized.HasAnyRole(CurrentUserRoles, RolesAllowedToChangeSerial))
             {
                 dbObject.Serial = dtPutObject.Serial;
             }