diff --git a/apps/mtm/views.py b/apps/mtm/views.py
index 36508f4a..c0a6506c 100644
--- a/apps/mtm/views.py
+++ b/apps/mtm/views.py
@@ -378,7 +378,7 @@ class RouteViewSet(CustomModelViewSet):
         if routepack and routepack.state != RoutePack.RP_S_CREATE:
             raise ParseError('该工艺路线非创建中不可编辑')
         ins_n:Route = serializer.save()
-        if ins_n.material_in != old_m_in or ins_n.material_out != old_m_out or ins_n.process != process:
+        if ins.from_route and ins_n.material_in != old_m_in or ins_n.material_out != old_m_out or ins_n.process != process:
             raise ParseError("该工艺步骤被其他步骤引用, 无法修改关键信息")
 
     def perform_destroy(self, instance:Route):