I have a saved search that shows lines from a Sales Order. I am trying to show the backorder quantity that shows on the line item in the sales order itself. But SS only shows Quantity/Quantity Billed/Quantity Committed/Quantity FulfilledReceived. It does not show the Quantity Backordered bucket. Does anyone know how to get that either the actual field or calculation?

Backordered is just quantity remaining - committed

Subtract quantity fulfilled/received if you do partial fulfillments