Back Ordered Column in Invoice or Cash Sale

In Invoice or Cash Sale, the Back Ordered column does not refer to the company's inventory data. The Back Ordered Column of an invoice or cash sale is populated when an order is invoiced before fulfillment. Hence, an item is billed before it is delivered.

The Invoice in Advance of Fulfillment preference which allows users to invoice customers for the full amount prior to the complete fulfillment of an order may be verified by navigating to Setup > Accounting > Accounting Preferences > Order Management tab.