So, you cant turn a prepayment invoice to temporary after it is made permanent. However, you can cancel the prepayment invoice and create a new one for the same purpose. To do so, cancel all payment workflows before you cancel the prepayment invoice. When you create the new prepayment invoice, enable the Allow prepayment application option.
The classification of a prepayment invoice as permanent isnt reversible.
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Can I changes another temporary drop-out 25-cent take temporary?