How to fetch the Work Schedule details using HCM Extracts

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I have an Requirement to fetch the Work Schedule details of the Terminated Employees from the Payroll Period start date to the Termination Date.

I am trying to fetch the Work Schedule details using HCM Extracts. In view User Entity Details i found one UE 'HWM_EMP_SCHD_EMPLOYMENT_SCHEDULE_UE'  which consists of PER_AVAILABILITY_DETAILS.GET_AVAILABILITY_DETAILS function which is used to fetch Work schedule details. But i couldn't find the contexts which are passing in that UE in any other UE to make it as ROOT UE. And there are no Context setting user Entities also for that UE.