Sounds like a bit of a mess. because 1127 is non resident (not really a tax) tax and your client was full year NYC resident?

IF that's true you, might try a part year NY return and show him non-resident for 1 day. That may allow the 1127 withholdings to flow...

Truthfully, I'd probably call the NY DOR and ask them if he can efile the IT-201 and then paper-file an 1127 to claim the refund.

(edit: I douibt that Proseries is wired to handle this type of situation).