I currently got an issue with the refuelling truck working together with the Aerosoft Airbuses of the Professional Series for P3D. What happens is that the Fuel Truck arrives at the plane and attaches to the plane as normal. It then queries me to then enter the amount of fuel via the airplane menu, which I do. But it does never recognize the amount of fuel I entered in the Airbus MCDU and stays stuck at triggering me for the amount of fuel. It also blocks the fuel load button in the Airbus MCDU while doing this, so the only way to get out of this is reseting the whole parking position.
I'm not sure with which update this problem first appeared, but it still persists and both the Airbus and GSX are updated to the most recent version. My Sim is P3D v4.5.