Handling backordered items (Sales)
If you've entered an order, display the order and click Change to Invoice. Once the invoice is displayed, adjust the amounts in the Received and Backorder columns to reflect the number of items you've actually received and the number that haven't arrived yet. When you click Record, an invoice for the items you've received will be created, along with another order for the items you haven't received.
If you didn't enter a quote or order for the items, enter an invoice as you normally would, and enter the backordered quantity in the Backorder column. Again, when you click Record, an invoice will be created for the delivered items, and an order will be created for the items still on back order.