Back orders a when a customer orders an item that is out of stock. You then order the item in from the supplier and then invoice and charge the customer once the item is back in stock,
From the New Sale screen, highlight the rows that are to be placed on backorder.  Then select Bookout, Create Backorder from the menu button on the toolbar.
Create a new sale, and enter the Customer's ID in the Customer ID field.
Bookout, Complete backorderok.
Select Sales, Backorders from the main menu.
The list will show all the items that are currently on back order.
Select Sales, Backorders from the main menu.
delete button on the toolbar.