Call get_recursive_orig_value if field is proxy field.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@16530 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/Form.py

@@ -141,6 +141,10 @@ class TALESValue(StaticValue):
       LOG('ERP5Form', PROBLEM,
           'Field.get_value ( %s/%s [%s]), exception on tales_expr: ' %
           ( form.getId(), field.getId(), id), error=sys.exc_info())
+      # field may be ProxyField
+      try:
+        value = field.get_recursive_orig_value(id)
+      except AttributeError:
         value = field.get_orig_value(id)
 
     return self.returnValue(field, id, value)