You can submit cancellation requests for an entire order or a particular shipment. You can also submit changes and cancellations at the same time.
Click the Orders tab, and then click Purchase Orders in the task bar below the tabs.
Search for and select a purchase order, and then click Request Cancellation.
On the Request Cancellation page, click Submit.
Note: To cancel a few shipments, but not the entire order, click Show in the PO Details section, and then select Cancel from the Action list of values (on the shipment line you want to cancel). Enter a cancellation reason, and then click Submit.
Canceling an order by a buyer or supplier
If a buyer or supplier cancels a shipment and enters a reason for the cancellation, then the Reason column is populated in the Shipments table in the Order Details page. If a shipment is cancelled by a buyer or a supplier, the status of such a shipment is Cancelled.