Use this window to undo a customer order delivery. This will reverse the customer order/order line status back to Partially Delivered or Picked. For each delivery, you would get a delivery number per customer order line/release number. As long as a delivery note is not created, you could undo any specific delivery number by right-clicking and then clicking Undo Line Delivery on the specific line in the table. Once a delivery note is created, you could only undo the delivery of the whole delivery note only.
For shipment deliveries, you could only cancel the shipment as a whole from the header. This would move the shipment back to Complete state if it was closed. For consolidated shipment, you should undo delivery per shipment.