I have a customer that uses SPS to notify me (the vendor) that their orders have been placed. They also use their own system for submitting and invoicing. I have had requests to cancel 2 of their orders. They have done so on their system but don't seem to know how to on SPS. I have added comments to both orders but have gotten no response. Is there anyway I can cancel or reject the orders as the vendor? The PO's am I speaking of are GN20780954 & IS50027643.