extraTex not working with vray GPU

[till_botterweck]

Hello,
im trying to render UV pass using "vrayextraTex" render Element with vray GPU.
It works fine with CPU but the same szene renders black when i switch to GPU.

I tried to find the issue, made a fresh Scene with just a box, added UV coordinates, added render element.
Cpu works like a charm, GPU render black.

What am i missing?
thanks in advance

uvPass_Box_Test_max22.rar

[hermit.crab]

Switch the UVW Map's Channel to "Vertex Color Channel" (since you're working with Vetrex Colors) and it works.