based on Invoice amount is not equal to PO amount the system should keep on hold

Summary: Requirement is the system should keep on hold for the below scenario
PO amount=200

at invoice line level after matching with PO the amount got changed to 230 so the Invoice amount is 230 where as PO amount is 200.
The system has validated the invoice .
is there any possibility to restrict or to go onhold for the invoice when the PO amount does not match with the Invoice amount.
We have tolerances in place and they are working however if the amount is changed then the issue is appearing.

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