[OM] 1 Delivery Has Many Delivery Lines, How to Backorder Only 1 Delivery Line

At Shipping Transactions form, query the delivery line by order number and item code (assuming this item has only 1 delivery line), enter the Shipped Qty as 0, Backordered Qty as the total quantity at the delivery line.Click Delivery tab, select "Ship Entered Quantities", press OK. If a delivery has multiple lines, only the selected line will be backordered.