Cisco WLCCA message question

[ALIAOF_]

I'm trying to figure out what exactly is this telling me?

20028,AP: The assigned channel is not in the DCA list. AP slot: 802.11b

I checked the RF Profiles and all areas and for 2.4 GHz only channels 1, 6, 11 are checked.  So why this message? 

[Flavio Miranda]

Hi

 The message is pretty clear. If you are sure that all channel are selected properly, that´s pretty weird.  What about the Country Code and AP model ?  

-If I helped you somehow, please, rate it as useful.-

[ALIAOF_]

I'm pretty sure there is no RF Profile or any custom settings just a global setting and its 1, 6, 11. Country is US
802.11bg:-A    802.11a:-A

Now one thing I'm noticing that AP's with a part number -B in them does not have this error message.

I can understand that for 5 GHz but why for 2.4 GHz?

Update: Found other AP's with 802.11bg:-A    802.11a:-A and not throwing that message.