One of my US colleagues had a funny experience on Cathay Pacific recently .His travel agent incorrectly inserted his wife’s American Advantage number into the booking and she was allocated the miles for the sectors on CX metal . He had some difficulty when he returned home getting the points correctly reallocated to his own account. (His wife decided that she wanted to keep them)
I had assumed Oneworld carriers have some sort of checking mechanism to ensure the wrong airline partners frequent flier number is not in the reservation.
Ozflier