Don't know if I understood the RA correctly, but I thought the actual fuel that was in the tanks at the end of last flight (when unloading the B733 or X-Plane) would be stored:
However, I now get strange fuel values each time I load the B733 - no longer the standard 7,500 kgs from previous versions, but also neither the fuel I had in the tanks at end of last flight, nor the fuel I loaded for last flight. It seems to be 2268 kgs for the wing tanks each and 3506 kgs for the center tank now.