unable to find the type "derived length of service: when creating life event

Summary: creating life event based on 2 yrs of service

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Unable to find "derived length of service" when creating life event is this only for seeded looking to create life event based on derived factor length of service "job seniority date" temporal life event not getting triggered after running all processes. I see the seeded LOS life event and it uses the derived length of service want to use this type for a new life event unable to find anything besides personal, absence, work, information, and end of disability. Can we add to this list of values