How do I force expiry of tapes?

Hi there.

I have a bunch of tapes I need to use.  All I want to do is add them back into the ScratchPool but as they have been written to and not yet expired I get the error:

"Cannot change media pool of an assigned media".

So I run this command:

bpexpdate -m <tape> -d 0 -force

And I get the error:

"requested media id is not assigned to this host in the EMM database"

I've tried this on master and media server and get the same result.

Any help would be appreciated.  Thanks