diff -r 3abde7651c38 -r 14b40afccd69 editors/ConfTreeNodeEditor.py
--- a/editors/ConfTreeNodeEditor.py	Tue Oct 03 16:12:55 2017 +0300
+++ b/editors/ConfTreeNodeEditor.py	Tue Oct 03 16:31:31 2017 +0300
@@ -496,7 +496,7 @@
     def GetItemChannelChangedFunction(self, dir):
         def OnConfNodeTreeItemChannelChanged(event):
             confnode_IECChannel = self.Controler.BaseParams.getIEC_Channel()
-            res = self.SetConfNodeParamsAttribute("BaseParams.IEC_Channel", confnode_IECChannel + dir)
+            self.SetConfNodeParamsAttribute("BaseParams.IEC_Channel", confnode_IECChannel + dir)
             wx.CallAfter(self.RefreshIECChannelControlsState)
             wx.CallAfter(self.ParentWindow._Refresh, TITLE, FILEMENU, PROJECTTREE)
             event.Skip()
@@ -534,7 +534,7 @@
 
     def GetChoiceContentCallBackFunction(self, choicectrl, staticboxsizer, path):
         def OnChoiceContentChanged(event):
-            res = self.SetConfNodeParamsAttribute(path, choicectrl.GetStringSelection())
+            self.SetConfNodeParamsAttribute(path, choicectrl.GetStringSelection())
             wx.CallAfter(self.RefreshConfNodeParamsSizer)
             event.Skip()
         return OnChoiceContentChanged