A batch fails to post and the log shows an error message that says "Contact System Adminstrator".
So you run the following query to get the detailed error message:
select * from gm_error_log
where 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") "