Diagnosis
This outbound delivery cannot complete the order, because there are noreference items in the delivery.

System Response
To check whether the order items to be delivered can be combined, thesystem requires at least one item for the existing outbound deliverythat has not yet been deleted, and that has a reference to an order.
If the system cannot find such a reference item, then the delivery isrejected. You then need to create a separate outbound delivery for thesales order.

Procedure
If the outbound delivery does not contain any more items, delete it.Then create a new outbound delivery for the sales order to bedelivered.