Proxy hierarchy in Outliner

Hello
I linked some objects into a new blender scene. One of this objects is its parent (see Proxy_01.png).

When I select the parent and its childs an press Ctrl-Alt-P to make a Proxy I get what you can see in Proxy_02.png.

The Parent-Object still acts as a parent but in the Outliner the parent-relation seems to be lost.

Question: How can I make a proxy of all objects in one step with keeping the hierarchy in the Outliner like it was in Proxy_01.png?

Alain

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