I have a problem in MAS90 especially for Vendor Invoice that already posted. The invoice wasn't show in the A/P Vendor Invoice inquiry and transaction inquiry but showed in the Checks payment. The invoice is already paid and posted it, however the posted was wrong date, then I was adjust to the correct date and month. Unfortunately the invoice can't enter again in the manual check entry or invoice data entry because when I entered this invoice number, the window's popup & won't allow me to change. It shows Duplicate Invoice. So how do I fix this? I need this transaction shows in the invoices and transaction in the vendor inquiry and posted to the G/L with the correct transaction.