How do I close a blanket PO? Send an email to the Purchasing Specialist who handled your order and request a change order to close your PO. Read more: Purchasing Manual: Introduction to Procurement Processes, Chapter 2: Purchasing Processes > Making Changes to a Purchase Order. Updated on October 15, 2020 Tagged: BlanketBlanket POCancelChange OrderPOPurchase Order Was this article helpful? Yes No Not what you are looking for?If you can't find the answer to a question, contact us by click on the button below.Contact Support