diff --git a/src/main/resources/mapper/base/BaseMapper.xml b/src/main/resources/mapper/base/BaseMapper.xml
index 8dfffe0..d5a0f49 100644
--- a/src/main/resources/mapper/base/BaseMapper.xml
+++ b/src/main/resources/mapper/base/BaseMapper.xml
@@ -1103,7 +1103,7 @@ dbo.Get_Part_DescSpec(site,WX_PartNo) as wxSpec,dbo.Get_WorkCenter_Type(Site,Wor
     <update id="updateSORoutingNextLast">
         Update SORouting
         Set PreItemNo =
-                 Isnull((Select Max(D.ItemNo) as PreItemNo from SORouting as D Where D.Site=SORouting.Site and D.OrderNo=SORouting.OrderNo and D.ItemNo<SORouting.ItemNo),0)
+                 Isnull((Select Max(D.ItemNo) as PreItemNo from SORouting as D Where D.Site=SORouting.Site and D.OrderNo=SORouting.OrderNo and SORouting.ItemNo>D.ItemNo),0)
             ,NextItemNo =
                  Isnull((Select Min(D.ItemNo) as NextItemNo from SORouting as D Where D.Site=SORouting.Site and D.OrderNo=SORouting.OrderNo and D.ItemNo>SORouting.ItemNo),0)
         where Site=#{site} and OrderNo=#{orderNo}