Need to delete an invoice after invoice rejection.

Hello All,

We are enabling Invoice approval workflow in an existing OU in test instance. The workflow is initiated in Payables and the Approver has rejected the invoice. The invoice has not gone thru the Invoice validation process and the status of the invoice is Never Validated. Since the delete button is enabled, we want to delete the invoice but i get the error message APP-SQLAP-97170: You cannot delete this invoice because Invoice Approval Workflow is processing or has processed it.

Why does oracle NOT allow us to delete the invoice when the invoice has gone through the approval process and nothing is pending from the workflow stand-point.