My company uses the fields service module alot more then most companies. We constantly have issues where we have to change out serial numbers and do supersessions or swap customer ids that are linked from one serial number to another customer. In doing so you need to usually move all calls related to that serial number to history. On the move call to history window it would be nice to be able to select a specific serial number in a look up window and move all calls that are invoiced to history. All open calls i normally go into the call and remove the sn until the sn move is done and then go back and add it back.