Do you want to undo a purchase order? Take the next steps.
1. Click on 'Purchase Orders'.
2. Find the relevant purchase order.
3. Click on 'View' behind the relevant purchase order.
4. At the top, click on the 'Refund' button
5. The purchase order has now been rebooked.
The status has now changed to 'Refund'.

Is it not possible to click on the 'Refund' button?
Check whether the status of the purchase order is set to 'Full'. Otherwise, this purchase order is not yet booked and crediting is not possible.