Add a field to the Shipment summary area (Screen ID SO302000) that will show the orderDesc field from the most recent order linked to that shipment. This will be a read-only field and will not be stored with the shipment.  

Im just using the sale demo data for this!     I'm using the    ePXDBScalar] for this but am pretty lost on how to use the search I know I want SOShipLine.tranDesc  most recent order from current selected shipment.