Bill Segment Exception
If errors are detected during the billing process, it may cause a record to be written to the bill segment exception table with a message indicating the nature of the severe error.
To view the messages associated with the exception records, schedule the TD-BSERR background process. This process generates a To Do entry for every record in the bill segment exception table.
Fastpath: 
Refer to How To Correct A Bill Segment That's In Error for instructions describing how to correct a bill segment.