Hi Michael,
You may take a look at SAP note:
831204 - Delivery items for packaging materials
Especially for the question 1, requirement 1:
Question 1 How can I get delivery items created for packaging material?
Answer: Delivery items are generated if at least one of the following two requirements is fulfilled. •Requirement 1 (valid for all releases):
an Item Category is assigned to the HU header and
Plant is defined for the HU header
If this requirement is fulfilled, packaging material item would always be generated in delivery.
Hope this helps.
Regards,
Alex