When posting a shipment from a sales order, all order lines are copied to the posted shipment. Also the ones you did not ship any quantities for. This could be seen as a 'backorder' funtionality.
However, when using Drop Shipments, only order lines on which has been actually shipped/received are transferred to the posted shipment.
Customer would also ike to see the 'backorder' lines for Drop Shipments.
Any ideas on how and where to achieve this?