Copying proxy object into scene creates duplicate materials.

[Karol.Osinski]

I have few different variations of tree sharing the same materials. My general workflow with proxies is as follow:

1. I generate a proxy from an object with "Automatically create proxies" box ticked so I got a proxy with the shaders already attached.
2. I noticed saving proxy as .mb file and importing it afterward to the scene does not work and you loose all the shaders
3. Instead select proxy object and COPY -> PASTE it directly to another Maya scene.

Work well ,except every time I PASTE a new proxy object which does share all the materials, it duplicates all the materials.

Is there any way to avoid it or I simply approach it wrong?

[hermit.crab]

The duplication of materials is a Maya behavior, it is not VRay proxy exclusive. To avoid it you may try importing all proxies after the first one (which will carry the material) via the 'Import Proxy' option in the toolbar and apply the already copied material.