Originally Posted by KVS
You don't need an IATA card for that -- I have done the same thing before using the print-out of
IATA Resolution 735D that I always carry

.
Oh, I know, it was just nice to flash the card and see her follow the rules (at least as he told the story). Any evidence that you know what they can and can't do would likely work.
As for a print-out of 735D, that sounds vaguely familiar. I'm guessing something similar to Rule 240/Contract of Carriage?