Originally Posted by JörgH
Maybe it was already answered, but is it fine to add the AY+ number later after the booking was made?
I doubt that the system even track whence the FFP reference was added, and it would be kind of unfair to program members who simply forgot to add the number during the booking process. I would be surprised if the system checked the date of joining the program either.
So I expect that it would work regardless in practice. But it is ostensibly not supposed to work, and you'd have no recourse if it does fail for any reason.