Clipping plane (v8); use layers of referenced block to include/exclude

Hello all,

We create - among others - workshop drawings by inserting a block (linked and active) with a layer structure into our lay-out, which is a different file. We want to use the powerfull feature of R8 to include/exclude objects which are part of the imported block, however that seems impossible. Sub-select items nor including/excluding layer works. Only when I explode the block - and the reference link is broken - everything works as expected.

Is this intended behaviour or can you guide me on how to deal with referenced blocks and clipping plane.

Looking forward to your solutions.

Roderick