galaxyflex

Hi All, I just fitted a trigger module A071-00-01 to my Flex. I activated it via option 51.50 and can now see the additional outputs in menu 53 (0001-0008). The issue I have found is that setting descriptor or control function returns the "Option Not Available" message from the panel. I was wondering if someone with a little more experience with the Flex could confirm if there's a way to set a descriptor & control function? It would be nice to be able to control those outputs through the GX App etc.