I'm curious as to why long-haul itineraries return "Cannot Combine With Outbound Selection" when trying to mix bookings across World Traveller and Club World (e.g. Out in WT, back in CW). It seems like this would be a pretty common request for those who value the bed on a night flight but don't care about that stuff for a day flight.

Is there any way to make bookings on this basis without having to take the non-Club-World sector in World Traveller Plus? Just interested in what the rule behind this is.

Thanks!