Under the deletion job history on:
Enforce> System > Incident Data > Incident Deletion
You can see the status as 'duplicate' and the incident count is 'zero'.
Symantec DLP Enforce: 15.8.x / 16.0.x / 16.0.1.x / 16.0.2.x / 16.1
Explanation: * Only one incident deletor process should be running at any one time.
Our desired behavior is to report the "duplicate" status without rescheduling the deletion job since another deletion job is already running.
This is expected behavior and the product is working as designed.