Proxy of armature, applying poses greyed out

Given a armature that was linked from a file, a proxy is created of said armature.

Assigning a linked poselib to this proxy does not facilitate the application of poses in that poslib because the poses are greyed in the UI.

I have attached the relevant files.

Please see tester_consumer for the file that links from tester. tester.blend (618 KB)

Attachments

tester_consumer.blend (706 KB)