When you perform a 'Request Change' on a confirmed PO and add an attachment (restriction set to 'External'), and submit the PO to the workflow again, the PO gets the status of 'Confirmed' automatically, since no changes were made to this PO. In addition, no new PO confirmation journal is created. I expect adding an external attachment on POH/POL to have triggered a new purchase order version and subsequently a new purchase order confirmation. The absence of this feature causes vendors to receive a purchase order confirmation without all the necessary attachments.