Deleting Posted Invoices and Credit Memos
In Iceland, in accordance with legislation, Microsoft Dynamics NAV has been modified to prevent you from deleting posted invoices and credit memos. When you attempt to delete one of these documents, a message will note that the posted document may not be deleted. The Delete command is not available on the ribbon for the following document types:
Sales invoices
Sales credit memos
Purchase invoices
Purchase credit memos