to my knowledge, user needs to unapply payment from posted invoice as the first step, then create a credit memo. But your steps are not in that order. Just curious if the order is correct.
Another question, why BC doesn't allow you to use credit memo to reverse the prepayment invoice? it should be a standard feature regardless of what percentage has been invoiced as prepayment.
1. Post sales credit memo for the posted sales invoice
2. Unapply the prepayment invoice with the payment
3. Cancel prepayment invoice with GL journal because i cant use post prepayment credit memo function, it shows error: There is nothing to post because the document does not contain a quantity or amount.
4. Reopen SO and then edit the SO: i delete SO lines and then add the correct SO lines
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