E8.12 Reduce purchase order amount

[Rauf]

What is the best way to reduce the purchase order amount which is already finalized.
As far as I know, there is no option to enter negative amount in PO screen.

 

[DSauve]

If the PO has been received but not yet vouchered, you can reverse the receipt, change the amount, and then re-receive it.
If the receipt HAS been vouchered, you'd have to reverse the voucher first (and if the voucher was paid, it would be a royal pain, because you'd have to reverse/cancel a payment).
If the above don't work, you can always add a "J" type line to the PO with a negative quantity or amount (not both). "J" lines won't affect inventory, but they do need a valid G/L Account number to charge.