Outbound delivery &1 is on backorder (check shipping deadline)

What causes this issue?

The earliest possible pick date for the outbound delivery (&V2&) is
chronologically later than the goods issue date that was originally
planned.

System Response

Since the outbound delivery is not to be rescheduled (according to the
agreement), the shipping dates are taken from the order and not
redetermined. Therefore, the pick date that was originally planned and
then copied into the outbound delivery may be in the past.
However, make sure that the material staging data of the items is
redetermined in order to guarantee a correct availability check for
materials.

How to fix this error?

Make sure you account for the fact that the outbound delivery is overdue
when planning and carrying out other shipping activities.
IF &[SWITCH]S4H_DOCU_ON_PREMISE& = 'X'.

Procedure for System Administrators

In Customizing, you can <DS:SIMG.SIMG_CFMENUOLSDVOLF>define per delivery
type</> whether the shipping dates should be redetermined in the case of
overdue deliveries.
ENDIF.

Error message extract from SAP system. Copyright SAP SE.