Access to page variables for Add.Person Info Page, get the Person ID and use it in Table value set

Summary:

We have a requirement to prepare a table value set that populates specific values for the person we enter the EFF info for. We'll prepare this value set and use in the Person Extensible Flexfield segment. When writing the where clause in the table value set, we need to have a way of refering the person_id of the person.

If we needed to get the logged in Person_id in the where clause we would be able to use "HRC_SESSION_UTIL.get_user_personid​". But what we actually need is the person_id of the employee for whom we enter the EFF record. So there must be a similar way or method to gather that.