I had CBR under code AXA for 5/31 thru 6/13 at $94 a night without tax. I called with the AP code and was told that I could only apply the code to the first 9 nights. The CM had to book the first 9 nights under a new reservation to get the AP rate of 82.51 a night including tax. He then modified my existing reservation for the remaining nights. Those nights will stay at the $94 a night rate. I will have to recheck in on 6/9, but he told me to tell them when I first check in that I have two back to back reservations and we will not have to change rooms.
I wish I could have gotten the entire thing under the AP rate, but it still saved me $345. This certainly made buying APs worthwhile, especially since we will be using them again in October. Since I had already paid in full for my trip, the CM credited what was required to each reservation and the remainder will be credited back to my Visa.
I'm assuming that they had used up all the available nights alloted to the code at CBR.