Multiple prepayments with the same amount on the same PO

For this kind of prepayment right, I keep getting an error for the second 20%. I have no issue posting greater amount, but an error will popped out if it’s the same/ lower amount.

The error shows as ‘There is nothing to post because the document does not contain a quantity or amount.’

For instance, I already clicked on ‘Reopen’. Also already refill the amount with the same amount.

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Std bc only allows one for one prepayment per PO.