Vray Material : can't link an UV set while file is in amount

Hi, I have an issue. I can’t link an UV set ta a file that is plugged in the Amount parameter of a Vray Material.
I can’t see the file in the Relationship Editor. When I move the file in Opacity map I can see it, but not when it’s in the Amount.
I use Maya 2012 and Vray 3.0

Thank you

The same is for lambert. It seems to be a Maya thing. You can try with the 2d placement options of the uvw generator.

Okay, thank you for your answer.