BN100 not creating BN70 records

The BN100 is not consistently creating BN70 records. I have multiple employees with the same action code, all moving from benefit eligible to non-benefit eligible.  The BN100 has no errors and shows the benefits stopped and the employees removed from the correct employee groups. .  The only difference in the employees are the different status codes they are moving to (all non-benefit eligible status codes).  Where in Lawson are the status codes linked to the different occurrence types?  How are the BN70 records generated from the the BN100?  How is Lawson determining the occurrence type to use?