There are times when you need to cancel a purchase order, a line item, or an individual item on a line item.
A purchase order, line item or copy can only be to be cancelled if the purchase order has been activated and has a status of On Order.
Purchase orders, line items or copies that have a status of Received are not cancellable.
Purchase orders that have not been activated, i.e. are still Pending, can be set for overnight deletion. See Setting a Pending Purchase Order for Overnight Deletion. Line items or copies can be removed from a purchase order that is still pending.
Whenever you plan on cancelling an order in Evergreen, check with your vendor first to make sure they are willing to cancel the order. The vendor should always be notified that you are canceling an order before you cancel it in Evergreen. This is true for an entire purchase order, a line item or a single copy on a line item.