Diagnosis
Cancellation document &V1& sent in by the customer does not contain allof the items in the billing document that are due to be cancelled.
The cancellation document does not contain item &V4& from billingdocument &V3& (external document &V2&)

System Response
The system terminates processing of the intermediate document (IDoc).

Procedure
Add the missing item to the IDoc and process it again.