Can you explain the new spec codes that allow the User ID to print on an invoice?

The release notes mention E127 - last edited by user. I assume this prints the user ID of the last user who edited the invoice.

However, in specification maintenance, there are additional User ID fields, such as "last printed by user (invoice)", last printed by user (credit note)", etc. None of the (credit note) codes seem to work.

What we'd really like is the user ID of the user who CREATED the invoice, not just the user ID of the user who last EDITED the invoice. Management reviews invoices before they are printed, and thus the managemer's user ID will appear on all of the invoices, which is not the desired result.

Steve