Can we place hold on Payables Invoice when Billed amount/Qty less than PO amount/Qty?

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We have client who wants system hold or any other hold on Payables Invoice for any variance between Invoice amount/Qty and PO amount/Qty. We have set up 0 tolerance on Qty and amount. However the tolerance works only if Billed amount/Qty exceeds PO amount/Qty and not the other way around. Is there any way to place the hold on all the invoices that have variance?

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