Within AR Billing can you differentiate between who creates versus completes in a report?

Currently Oracle does not provide a workflow solution for AR Invoices/Credit Memos that are manually created. We have successfully been able to separate the access so that the analyst can only create and the supervisor can only complete. We are running into an issue where we need a report that allows us to identify who created the invoice/credit memo and also who completed it. Is this separated out in Oracle? Currently I can only find the field that shows who created it and not who completed it. Any help would be appreciated!