[itsm] Unlink config item

Hi, While experimenting with configuration items, I entered some building locations for our customer. I then linked one of the locations to a test ticket. Unfortunately, I selected the wrong type of link. I then re-linked the location to the ticket (with the correct type), but now it has two links in the 'linked as' field (which seems logical as indeed, some configuration items might have more then one type of relationship to other configuration items). What I can't find is how to remove/correct the link type/relationship. Is there some 'unlink' functionality? Can anyone help out? Thanks, Regards, Tom