If the PO is completed that means no lines on the PO are awaiting a receipt. Can you check if the lines that did not have a receipt on the PO have the Complete box ticked?

Where are you seeing the amount as a commitment?

Here is an example.  There are 2 unbilled lines on this old PO.  Should they be left this way?  Is this accrual being held?  

Generally, the accrual entry will only be generated when the Purchase Receipt is released.

If all the received items have been billed and the remaining open items items are not expected to be received there are 2 options to close out the PO.

1. if you ordered a qty of items and 0 of them were received and you aren’t expecting to receive them, select the “Cancelled” checkbox for that line.
2. If you ordered a qty of items and some of them were received and billed, and you aren’t expecting to receive the remaining balance and there are no further bills to process, select the “Closed” checkbox for that line.

This is an issue I just ran into myself.  My opinion it the “Complete Order” action should be re-evaluated.  Here is what is happening, user selects the action “Complete Order” even though it has not been fully received.  Acumatica marks all lines as “Completed”, however this will not remove it from the “Open” committed amount on the Project, so although the PO is completed, the Project still thinks there is an open commitment creating inaccurate reporting on the project.  In order to fix this you will need to do the following:

• Reopen the Purchase Order
• Go to each line and make the “Closed” check box is checked or the “Canceled” check box is checked.
• Remove hold on the PO and it should change to a “Closed” status automatically or you may need to re-run the approval process if you have that activated, which I know is a bit of a pain.

Ideally Acumatica should prompt the user if all lines should be closed when the action “Complete Order” is selected or just mark all the lines completed.