> I got the same spiel from Enetica, but when I pushed the issue was told
> "anything at all, just fill in the field with something" - a bunch of
> 1's would probably do the trick and would signify to the person
> processing the order that this one obviously has no valid number such as
> an ABN.

I was under the impression that on application you are agreeing to
'Registrant Agreement' which state that

"all the information set out in your Domain Name application, and all
information you give us, are true and correct, and not misleading or
deceptive"

You can't have it both ways.