Process instances got deleted

Document ID : KB000100173
Last Modified Date : 05/06/2018
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I am no longer seeing process instances which were not completed yet, it appears they got deleted.
CA PPM out of the box have a job called "Delete Process Instance" which can be scheduled to run but it would only delete Aborted and Done process instances. In this case they were not in any of the above statuses.
In this scenario you check app-access-YYYY-MM-DD.log and search for action "bpm.deleteSelectedProcessInstances" which is being called when user attempts to delete process instances via UI.