If you attempt to record a sales invoice with an insufficient on-hand quantity (see Complete the sale), and you don’t allow the recording of sales with insufficient quantities, the Backorder List window appears. In this window, you need to build or buy the required quantity, or create a customer sales order (backorder) for the unavailable quantity, before you can record the sale.
Before you can auto-build an item in the Backorder List window, you need to set up your item details. For more information, see Auto-building items. If you want to record a bill using this window, you need to enter a default supplier for the item. For more information, see Creating items.