Greetings
A client of mine is having a problem posting two sales invoices. Whenever he tries posting (F11) the invoice, an information dialog box appears stating that the sales invoice already exist.
I have checked Posted Invoice, checked the Sales Invoice Header and Sales Invoice Line; the Invoice number does not appear, indicating that the sales invoice has not been posted.
What could be the problem causing this, and how can it be resolved, apart from amending the invoice number prior to posting.