Value is obsolete; use valid values

What causes this issue?

In Release DI46B and DI46C1, the field <ls>Automatic PO Determination
</> controlled purchase order determination and enabled you to create
inbound deliveries without a reference to a purchase order.
<DS:GLOS.D85B5AEF70E8D411BCBA0800060D9C68>Inbound deliveries on hold</>
(introduced in Release DI46C2) include inbound deliveries which do not
refer to a purchase order. There is an extra field for controlling the
creation of inbound deliveries on hold.
If there are old settings in the system, these obsolete values are
interpreted in a way which allows creating inbound deliveries on hold.

System Response

Saving the delivery type is not permitted.

How to fix this error?

Select a valid value, and maintain the settings for inbound deliveries
on hold.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.