VLAN on an SSID

I added a VLAN to an SSID and relaized it was in error, as i attempted to remove the VLAN from the SSID its returns and error "Input not as expected". I have removed any policies, addresses and interfaces using the vlan, with the same result.

Any help to find other reference points i may not have thought of would be a great help to remove this, thank you.

-Bry