Always been a problem with back to back including a repo , if the combination is not on the system not a lot booking agents can do ,there seems to be no way of doing a manual overide which would also mean having to come up with a unique cost which they havnt got the authority to do ,done it a few times in the past as two x cruise only and book your own one way flights ,but at the moment with the flight cancellation carnage i wouldnt book anything that wasnt the full package