"Rebook onto a British Airways operated service on the same routing into the same class as the original flight or lowest availablein the same cabin."
I think I know the answer but still ..... If I were to rebook a shorthaul RFS (or a highly restricted O or N class ticket) onto a flight that only has full Y availability, does that mean I thereafter have a full Y ticket when it comes to making future changes ? If not, what is the relevance of re-booking into the lowest class in the same cabin; why not just re-book into the same cabin ?