Did the "only as many levels in a power as Magic" make it into the 2nd printing of the CRB? I thought it was absent from the first printing of the 6th edition CRB. At least I didn't see it.
Edit: Ninja'd
2nd Edit: And FWIW, it's a silly fiddly rule that isn't particularly meaningful. Why can't a 4 Magic Adept have 5 levels of Combat Sense? No real balance reason for it, either the PP cost is balanced or it isn't.