SAP Message VF188 - Data inconsistency during processing of document &1

Diagnosis
When processing the document &V1& data inconsistency is discovered. Thereasons for this inconsistency are described in the following messages.

System Response
Processing of the documents stops.

Procedure
Analyze - if available - the following messages. After the causes havebeen established, processing can be repeated.

311214Doc number with additional 1 in output VF188
151267VF188 - no cancellation of external billing docs.
489676External billing documents cannot be cancelled due to VF 188