I have experienced the same thing, but I just deleted my creation when I knew how many points it would cost.
What I usually do, when I want to create the likes of Carrick, is go to the Spurs squad (or whatever team the player is at) and see what young players or players that don't get a look in, are on the team, and then use one of those players to create a new one. As their nationality (aslong as they are not an international) can be changed in PES4, you can create Michael Carrick just as you could in 'create-a-player'.
I'd rather use this method than shell out loads of points simply to register a created player in their team. I have done this with John Spicer for Emanuel Eboue and a number of others.
i.e Stephen Kelly change to Michael Carrick