How to close a PO with line doing nothing.

Hi @Yvonne 

Below I have mention at what point a PO can have different status. 
So in order to close a PO the parts have to be received into stock or remaining purchase order lines have either been manually closed or cancelled. 

Hence please check whether other POs which can be closed have met these criterias. 

Planned: Automatically assigned when saving the purchase order header. You can either release, directly confirm or confirm with differences (you might have spoken with the supplier over the phone), or stop the purchase order.

Stopped: The purchase order is temporarily frozen for further handling in the order flow. You must release the purchase order to be able to continue in the work flow.

Released: The purchase order is ready for further processing in the order flow.

Confirmed: The supplier has approved delivery for the desired dates and quantities on the purchase order, or a note of changes has been sent to you and you have confirmed the purchase order with some differences.

Arrived: All ordered parts or partial quantity have arrived on the premises, but need to be (inspected and) received into stock.

Received: All ordered parts or partial quantity have arrived and been (inspected and) received into stock.

Closed: All ordered parts have been received into stock, or remaining purchase order lines have either been manually closed or cancelled.

Canceled: The purchase order is no longer valid.

Best Regards,
Tharaka.