Field help (MANAUT) 

This field is not enabled for Sage Pay and is set to No.

If Sage Exchange is the payment processor, you can select an option for auto backorders.

Select Yes to automatically create a payment card authorization record for backorders, partially shipped orders. The authorization record is created when the subsequent shipment(s) are generated.

Select No if the partially shipped order is placed on payment hold until a card is manually selected.