Payables Invoice Approval help needed - AME

  I need to have employees approve invoices using AME approval rules if the PO  match is two way.

All employees have an email address but not all employees have a user_id (FND_USER)  Most employees are not Oracle users.

The rule is to send the approval notification to the Requestor on the PO if it is a two way match. (There is always a requestor Deliver_to_person on the PO).

The rule works fine if the Deliver_TO_Person is an employee that is attached to an Oracle User.  It does not however work for employees without a user_ID.