32 Campus APs is the platform limit for the 3200 series, regardless of how many AP licenses you put on it.
4 RAPs = 1 Campus AP in terms of Platform Capacity.
If you have 32 Campus APs, you can get 4 more RAPs on by removing one Campus AP and that will leave more space for 4 RAPs, BUT you will be at your platform limit:
31 Campus APs + 4 RAPs = platform limit. You would need 35 AP licenses for that, because every AP, whether RAP or CAP requires an AP licenses.
Long Story Short:
3200 has a Capacity of 32 Campus APs or 128 RAPs (32*4). That means that theoretically you can load 128 AP licenses in an all-RAP deployment. Each AP, whether CAP or RAP requires an AP license.
You can find out whether you are at the platform limit by the formula - (Campus APs + (RAPs/4). That number has to remain under 32 for the 3200, 64 for the 3400 and 128 for the 3600. Again, each AP and RAP that will terminate on a controller concurrently need to have an AP license, but you are constrained by the platform limlt
In your situation, you have already reached the platform limit, regardless of how many licenses you have applied.
I hope that does not make things even more confusing.