You can make a correction to an order after you have posted a prepayment invoice for the order. You can add new lines to an order after issuing a prepayment, and then you can post another prepayment invoice, but you cannot delete a line from an order after a prepayment has been invoiced for the line.
The following procedure shows how to issue a prepayment credit memo to cancel all invoiced prepayments for a sales order.
In the Sales Credit Memo window, proceed to correct the relevant entries, as for any sales credit memo. For more information, see How to: Process Sales Returns or Cancellations.
To Reduce the amount in the Line Amount field, you must first increase the prepayment percentage on the line so that the value in the Prepmt. Line Amount field is not decreased below the value in the Prepmt. Amt. Inv. field.
To make a prepayment invoice for any new lines in the sales credit memo, choose the Prepayment action, and then choose the Post Prepayment Invoice action or the Post and Print Prepmt. Invoice action.
Invoicing Prepayments
Walkthrough: Setting Up and Invoicing Sales Prepayments
Finance
Working with Dynamics NAV
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