Not contractual, more of a programming issue that has never been rectified.

Your best bet is to put in to drop the March trip (I know, unlikely due to coverage) and advertise the trip. I’ve been amazed at the garbage I’ve advertised that someone actually picked up. Once the trip is gone you can do a straight pickup of the trip you want in the seniority trip trade window or real time window as appropriate.

Drop in one transaction, pickup in a separate transaction in the next trip trading window.