A batch fails to post and the log shows an error message that says "Contact System Administrator".
So you run the following query to get the detailed error message:
WHERE BATCH_NUMBER = [Batch number]
AND ERROR_LEVEL = 'E';
The error message in this case is:
gm.process_batch_detail; ORA-01400: cannot insert NULL into ("PBDS"."TRIB_NOTIFICATION_EXCLUDE"."TRIBUTE_SEQ")