How to fetch candidate person id parameter in value set

Summary:

We have created context segment to fetch candidate country code. But country code parameter is not present for PER_PERSON_EIT_EFF flex field. So please suggest how we can fetch candidate person id in value set and with the help of person id fetch candidate country code.

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I created below value set but its not returning values.

Value Column Name

HZG.COUNTRY_CODE

FROM Clause

HZ_GEOGRAPHIES HZG, IRC_REQUISITIONS_VL REQ, IRC_GEO_HIER_NODES IGHN,irc_submissions SUB,irc_candidates CAN