SAP Message AJ871 - Child print doc. reversal: Doc. no.&1 (doc.no.&2 for PI) ended with error

Diagnosis
The document to be reversed (document &V1&) belongs to an installationgroup. It is connected to document &V2& from theprimary installation.
In this case, document &V1& must be reversed separately.
However, an error occurred during the reversal of document &V1&.

Procedure
Correct the error in document &V1& and start the reversal again.