Diagnosis
As a group generated by using product selection was copied frompreceding items, at least one sub-item was copied into the shippingdocument, but its corresponding main item was not copied, even thoughit is relevant for shipping.

System Response
If this system message has a messagecategory of 'E', such sub-items are deleted.

Procedure
Make sure the main item in the preceding document can be shipped in thesame delivery as its sub-items.