Handling backordered items (Purchases)
If you've entered an order, display the order and click Change to Bill. Once the bill 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, a bill 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 a bill as you normally would, and enter the backordered quantity in the Backorder column. Again, when you click Record, a bill will be created for the delivered items, and an order will be created for the items still on back order.