Not all config may be removed and ...

The complete warning is 'Not all config may be removed and may reappear after reactivating the sub-interface', this case almost the same with previous post about subinterface Frame Relay. But this is work but if verify still appear previous subinterface with status deleted. Work that I mean, if I attach new IP address is OK, but I don't know may be there is other feature doesn't work. Finnally I still use with status deleted in subinterface, so far it's ok.

#sh ip int b
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES NVRAM  up                    up      
FastEthernet0/0.1          10.10.100.1     YES NVRAM  up                    up      
FastEthernet0/0.2          10.10.200.1     YES NVRAM  up                    up      

#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
(config)#no int f0/0.1
Not all config may be removed and may reappear after reactivating the sub-interface
(config)#no int f0/0.2
Not all config may be removed and may reappear after reactivating the sub-interface

(config)#default int f0/0.1
Building configuration...
Interface FastEthernet0/0.1 set to default configuration
(config)#default int f0/0.2
Building configuration...
Interface FastEthernet0/0.2 set to default configuration

(config)#do sh ip int b    
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES NVRAM  up                    up      
FastEthernet0/0.1          unassigned      YES NVRAM  deleted               down    
FastEthernet0/0.2          unassigned      YES NVRAM  deleted               down    

(config)#default int f0/0
Building configuration...
Interface FastEthernet0/0 set to default configuration

(config)#do sh ip int b  
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            unassigned      YES TFTP   up                    up      
FastEthernet0/0.1          unassigned      YES NVRAM  deleted               down    
FastEthernet0/0.2          unassigned      YES NVRAM  deleted               down    

(config)#int f0/0
(config-if)#ip add 10.10.10.1 255.255.255.0

(config-if)#do sh ip int b                 
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            10.10.10.1      YES manual up                    up      
FastEthernet0/0.1          unassigned      YES NVRAM  deleted               down    
FastEthernet0/0.2          unassigned      YES NVRAM  deleted               down