You can cancel a Purchase Order in the system. To go through with this, you need to check that the PO in question meets specific requirements. In this regard, you need to pay attention to the PO status. It has to mark "Open."
On the other hand, if it is already received or partially received, you will first need to unreceive it, and only then will the status change to open. To know how to unreceive a PO, read the steps in the following article:
How to un-receive parts on Repair and Purchase Orders?
How to un-receive parts on Repair and Purchase Orders?
