Cancel and reject purchase order items
If a supplier is not able to fulfill an order or the quality expectations are not met, you can update the purchase order to reflect this by canceling or rejecting items.
To cancel means that you are canceling the purchase order or part of it. You do not need or want the items anymore.
To reject means that you are not satisfied with the material you have received and, therefore, reject the delivery.
You can cancel or reject only the outstanding balance of a purchase order item. If you need to cancel or reject any material that has already been received, it should first be unreceived.