CLOSING PO BASED ON AMOUNT ; ORACLE 12.1.3

Dear Team,

Is there any way system can close PO automatically when PO matched amount reaches certain threshold value:

For Example:

PO AMOUNT: USD 1000

INVOICE MATCHED AMOUNT: USD 975

I want system to close PO when variance between po and invoice amount is USD 25 or less as discussed above.

We can define tolerance based on quantity only. Is there any alternative we can close PO auto based on threshold value discussed above.

Do we need to do any customizations / form personalizations?