Linking constraints drivers

Hi guys! I’ve created my character and linked it into my animation scene. I have the options of turning the arm’s IK on/off(original), but when I go to the file where I have the linked character(animation scene), it’s just not working at all…it doesn’t see the ‘constraint driver’. Is there a way to tell it to also ‘call’ the constraint’s driver from the original file?

Thanks!

Ps. The driver is a bone (part of the armature that is being effected) that is also linked with the group, so it is in the file.

I’ve also had the exactly same problem with a character that I linked to an animation scene. If anyone has The Knowledge, I’d be grateful to hear about the solution.

In my case the Limit Rotation constraint works, but IK and Copy Rotation constraints don’t.