Just an FYI, I have a FWF60E and I purchased a FAPC24JE AP but that AP is NOT listed as a model that I can build a profile for. I made sure it had 5.4.2 firmware in order to support 6.4.1, but I can't get it to be recognized. TAC just said I need to do this:
Technical Note: How to enable FortiAccessPoint-C compatibility on FortiGate
This article describes the command to enable FAP-C compatibility on FortiGate.
FortiAccessPoint-C compatibility with FortiGate is not enabled by default. In order to enable FortiAccessPoint-C in FortiGate use the following command: