CUSTOM: allow selecting destination function on order line

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/OrderLine_view.xml

@@ -118,6 +118,7 @@
                         <string>my_source_trade_title_list</string>
                         <string>my_base_contribution_list</string>
                         <string>my_destination_account</string>
+                        <string>my_destination_function</string>
                         <string>my_source_account</string>
                         <string>my_use</string>
                       </list>