Delivery note item & &: DTUC status not DTUC-relevant

What causes this issue?

You are trying to process a delivery note item
that has been flagged as not DTUC-relevant.

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

System Response

How to fix this error?

Check if the item status has been set to DTUC-relevant on the tab page
<ZK>Status Overview</> in the delivery.
To enable processing of a batch split item, the status of the batch
split item must be <ZK>A</>.
There are various reasons why the status might not be set:
Has the batch split item already been processed (status <ZK>C</>)?
Is the batch split item still being processed (Status <ZK>B</>)?
Has a DTUC class been maintained?
Has the DTUC function for the shipping point/DTUC class been activated
in Customizing for <ZK>DTUC</>?
Have any user exits been activated in the DTUC check that are
restricting the function?

Error message extract from SAP system. Copyright SAP SE.