Unable to delete process instance from Administration > Data Administration > Processes > Initiated page:
It can be neither cancelled or deleted.
The following process instances cannot be deleted because either you do not have permission or their status is not yet done or cancelled
Release : All
The status 'Not Started' or in the Gray status means it is in the inactive state.
Run the following SQL statement:
set status_code = 'BPM_PIS_ABORTED'
WHERE status_code = 'BPM_PIS_INACTIVE';