File hierarki

[eldhead]

If I save my dwg-layouts with the "Linked x-refs" option there is no possibility to create a filestructure like below:

A
model -> model.dwg
ritdef -> layout.dwg

If the other consultans open layout.dwg there will be files missing. This is a bug according to Graphisoft.

So, my question is: Is there a workaround or how can I fix this without Autocad?