[AP] Preventing Duplicate Invoices

Duplicate invoices happen on the vendor side when multiple invoices with slightly different attributes (invoice numbers, dates, and sometimes amounts) are submitted for the same goods or services. Duplicate invoices also happen on the AP side when processing payment from a source document that is not a true invoice. There are many such documents that you will come across when entering AP such as: 

1. Purchase Orders
2. Shipping Receipt
3. Statements 
4. Sales Quotes
5. Payment Receipts

The only document that should be used to enter invoices into Vista is the actual invoice.