Displacement or Bump isn't working on Particles

[simonsimon]

Hi Everyone !

I've a pretty simple scene with some particles from shape instance that won't display displacement or bump. So: 


Am I missing something ?
Is it not yet implemented ?
Is it a bug ?

It's a Vray 3.6 scene.

Here's the file & a screenshot

Thanks a lot for your answers. 

Simonsimon
<3