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Below, an abstract view of closing a PO and "trued up" the budget (you use a BAP process to true up your budget). Below, we see there is a remaining balance on a PO for $10k. We can also see that there was an additional amount of $20k in the budget that was never used (committed or "exhausted" as a result of internal charges for example). (Please note: this example assumes you have issued the final invoice for the PO and it has cleared). Remember, sending a "final invoice" flag or, reducing a PO to zero does not actually close the PO. You must request a PO be closed.
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Finally, when you begin financial closeout you must initiate a PMU PMUa Status update and select “Active-Financial close out…”. Do not use the status “Complete” until all close-out functions have been completed.