diff -r 8e19df12b596 -r 3c4c1e076a34 ConfigTreeNode.py
--- a/ConfigTreeNode.py	Sun Sep 23 23:34:04 2012 +0200
+++ b/ConfigTreeNode.py	Sun Sep 23 23:56:53 2012 +0200
@@ -136,8 +136,9 @@
         if path == "BaseParams.IEC_Channel":
             old_leading = ".".join(map(str, self.GetCurrentLocation()))
             new_value = self.FindNewIEC_Channel(value)
-            new_leading = ".".join(map(str, self.CTNParent.GetCurrentLocation() + (new_value,)))
-            self.GetCTRoot().UpdateProjectVariableLocation(old_leading, new_leading)
+            if new_value != value:
+                new_leading = ".".join(map(str, self.CTNParent.GetCurrentLocation() + (new_value,)))
+                self.GetCTRoot().UpdateProjectVariableLocation(old_leading, new_leading)
             return new_value, True
         elif path == "BaseParams.Name":
             res = self.FindNewName(value)