WooCommerce Purchase Order Gateway

From time to time purchase orders need to be changed, because a customer has placed an order with the wrong PO number or made a mistake typing one in. Currently there’s no way to correct these problems on the Admin Edit Order screen. It would be very helpful to be able to edit the field when necessary, as you can the other fields on the Edit Order header, when customers make mistakes in the PO field like they do in every other field.