CISCO Aironet 1140 cannot change the management IP to be on another VLAN (Sub-Interface)

Cisco IOS Software, C1140 Software (C1140-K9W7-M), Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)

I'm trying to add a VLAN and move the mgmt IP on that VLAN.
I don't need a Wireless SSID or access to that VLAN.
The vlan is already member of the AP - switch port.
The vlan is already member of the Aggregated Fiber Link that connects the switches to the CORE switch and it's working good.

The procedure i made was successfull on two of the fourteen APs.

Attached is the anonimized actual configuration.
Here are the commands i'm trying to launch:

interface GigabitEthernet0.100
 encapsulation dot1Q 100
 no ip route-cache
 bridge-group 100
 no bridge-group 100 source-learning
 bridge-group 100 spanning-disabled
 ip address 172.17.xxx.183 255.255.255.0
!
ip default-gateway 172.17.xxx.252
interface BVI 1
ip address 172.17.xxx.183 255.255.255.0
exit
interface dot11Radio 0.2
 no ip address
exit

XXXXX HERE COMES THE FUN PART XXXXXXXX

interface gigabitEthernet 0.2
 no ip address
 !

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Well, before removing the old IP from the 0.2 sub-if, i'm able to manage the AP FROM THE NEW IP, as well as with the old IP.

After removing that IP, it loses mgmt connectivity forever: i'm no more able to manage it from the old nor the new IP.


Help....
 Cfg-AP3-2011-10-17-ANONIMIZZATA.txt