[c-nsp] L2 interworking on 7600 RSP720

[MKS]

Hi

I was trying Layer 2 interworking for ATM to Ethernet on cisco 7600
RSP-7203C software SRB1 advanced ip services

e.g.

interface GigabitEthernet5/2.20
 encapsulation dot1Q 20
end

interface ATM9/1/0
 no ip address
 no atm enable-ilmi-trap
 pvc 0/400 l2transport
  encapsulation aal5
 !
end

Then typing this command:
connect atm_to_vlan atm9/1/0 0/400 g5/2.20 interworking ethernet
I get
%CONN: invalid connection

can someone suggest to me what i'm doing wrong?

atm-to-atm local switching is working fine.

Regards
MKS