Item &1: delivery split due to conflicting header data (&2: &3 <-> &4)

What causes this issue?

Item &V1& cannot be shipped in the same delivery with the other items
in the document because the header data (&V2&) is different. The &V2&
item field has the value &V4&, but in the delivery checked for
concatenation it has the value &V3&.

System Response

Parts of this text can be copied from message VL014
The system issues this message if a delivery split is necessary.
This message either appears in the collective processing log or during
creation of outbound deliveries from projects or for subcontracting. It
informs you that the item specified will be shipped in a delivery other
than the delivery that includes the other items from the same document.
If there was a general problem with shipment of the delivery, a
different message appears.
If this message appears when you are creating an outbound delivery with
reference to a sales order in the foreground, it indicates that the
order item cannot be shipped with the current outbound delivery.

How to fix this error?

If this message appears when you are creating an outbound delivery for
a sales order, you have to create an individual delivery for the same
sales order to ensure that all items will be shipped.

Error message extract from SAP system. Copyright SAP SE.