A reversal of a prepayment invoice – not paid and not applied to the final invoice is not possible in an easy way.
The recommended workaround posting a credit note on the purchase order in order to reverse the open (not paid) prepayment invoice creates a wrong transaction date of the prepayment invoice because it is the system date*. Following this workaround we have to post a credit note für the creit note as well so that the vendor transactions are clear.--> this is no solution, this is a workaround for another purpose: reversing the open advanced invoices while posting the final invoice.
The reverse prepayment functionality,: there is a reverse prepayment functionality only when the prepayment is settled and applied to an invoice. You can get that functionality on the vendor form below. à this is only possible when a prepayment invoice is paid (settled) and applied. As we have an incorrect prepayment invoice it will not be paid (settled) nor do we have the final invoice the prepayment invoice could be applied to. This reversal function is only a reversal of the applyment not of the prepayment invoice.
*Microsoft: This is by-design. In current design, the invoice date in reverse prepayment transaction is reversal date, it should be system date instead of posting date (of the final invoice).
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