Once purchase orders are created, they may be submitted for approval. The approval process checks to see if the submitter has sufficient authority to approve the purchase order. Once the document is approved, it may be sent to your supplier using a variety of methods including: printed document, EDI, fax, e-mail, iSupplier Portal and XML. Once the purchase order or release is sent to your supplier, they are authorized to ship goods at the times and to the locations that have been agreed upon.