If you need to close or cancel a purchase order you must complete the following steps. 


If the PO is closed, the first step you would want to complete is simply re-opening the purchase order

Not sure how to re-open a purchase order? Click Here!

Step 1. First you need to find the PO, I would look here first: Administration > Inventory > Vendor Purchase Orders > Search On Order POs

Step 2. Right-click on the PO you need to cancel

Step 3. Select Receipts > View Receipts

Step 4. Select the line item and click Delete

Step 5. Enter the quantity 

Step 6. Click Change Status on the Left-Hand part on the screen

Step 7. Cancel this PO

Still cannot close your purchase order because it will not let you delete the receipt? Click Here!