Not working Thrustmaster Enzo FFB with GP3/4

I just bought a Thrustmaster Enzo FFB Steeringwheel (USB). But it doesn't work in combination with GP3 and GP4.

I'm using Win XP/Pro, newest Directx-version. The steeringwheel is fully recognized in the XP/ControlPanel. Calibrating/testing everything works fine but nothing at all (no steering, no pedals, no buttons) in GP3 and GP4. I've installed the GP3-patch 1.13 as well.... no effect at all!

Is there a solution for my problem... I've tried it on 3 different systems (Win/XP and Win98SE).... or... is this wheel not suited?

Thanks for your help...

X5