Andre, I opened a ticket for my company on this item we are on Utah Patch 7, and the response is that we have to wait for Patch 8 no workaround. So, what that means is that no development can be completed on Flow Designer if it requires a use of inline scripting that calls fd_data.<action/value>.
The good news is that when you check the problem ticket there are 89 cases associated and they have increased the priority of this to 1-high so, hopefully this will be fixed soon.
