added a comment

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@2743 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/SelectionTool.py

@@ -934,6 +934,7 @@ class SelectionTool( UniqueObject, SimpleItem ):
 
 
       # Save the current REQUEST form
+      # We can't put FileUpload instances because we can't pickle them
       pickle_kw = {}
       for key in REQUEST.form.keys():
         if not isinstance(REQUEST.form[key],FileUpload):