SAP Message VL256 - Outbound delivery &1 is on backorder (check shipping deadline)

Diagnosis
The earliest possible pick date for the outbound delivery (&V2&) ischronologically later than the goods issue date that was originallyplanned.

System Response
Since the outbound delivery is not to be rescheduled (according to theagreement), the shipping dates are taken from the order and notredetermined. Therefore, the pick date that was originally planned andthen copied into the outbound delivery may be in the past.
However, make sure that the material staging data of the items isredetermined in order to guarantee a correct availability check formaterials.

Procedure
Make sure you account for the fact that the outbound delivery isoverdue when planning and carrying out other shipping activities.

Procedure for System Administration
In Customizing, you can define perdelivery type whether the shipping dates should be redetermined inthe case of overdue deliveries.