[j-nsp] lo0 gone?

[Jonas Frey]

Hello,

i am trying to apply a filter to my RE, but lo0 is missing.
I can see it via show interface lo0 (without any ip address assigned)
but i cannot give a ip address to it and/or configure it elseway:
jonas at ffm1-edge# set interfaces lo    
                                ^
missing or invalid device number in 'lo' at 'lo'

>From the docs i can read that lo0 is internally generated...but where is
it?

6.4R1.6 here.

Regards,
Jonas