No its no the case, you can have several vlans going over one SSID.
Just create sub interfaces on the Dot1radio interface and Ethernet interface.
like this (this will pass the native vlan and vlan 2 and 3 ) -
interface Dot11Radio0.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 1
bridge-group 1 spanning-disabled
!
interface Dot11Radio0.2
encapsulation dot1Q 2
no ip route-cache
bridge-group 2
bridge-group 2 spanning-disabled
!
interface Dot11Radio0.3
encapsulation dot1Q 3
no ip route-cache
bridge-group 3
bridge-group 3 spanning-disabled
!
interface FastEthernet0
no ip address
no ip route-cache
hold-queue 80 in
!
interface FastEthernet0.1
encapsulation dot1Q 1 native
no ip route-cache
bridge-group 1
bridge-group 1 spanning-disabled
!
interface FastEthernet0.2
encapsulation dot1Q 2
no ip route-cache
bridge-group 2
bridge-group 2 spanning-disabled
!
interface FastEthernet0.3
encapsulation dot1Q 3
no ip route-cache
bridge-group 3
bridge-group 3 spanning-disabled
There is a guide here
http://www.cisco.com/en/US/products/hw/wireless/ps4570/products_configuration_example09186a00801d0815.shtml#vlanbr
