I just called up, gave them my exsisting reservation #, and asked if I could apply the BAP code to my reservation instead of the BAT code. And after some moments of hesitation and waiting...WALA she changed my reservation. I saved almost $20 more a night from my original discount!
Just call up, and don't volunteer too much info. If they need certain questions answered they will ask...then just answer truthfully. I didn't even know there were restrictions on the code; ahhhh ignorance is bliss I guess.
Good Luck!
~Cindy Z in CT