FUNCTION xx_po_req_appvr_mgr_fnc (p_req_hdr_id IN NUMBER) RETURN person_id_tbl2 PIPELINED so you should always have to have in your code "return person_id_tbl2 (type)". you must return variable of that type. But if you say "return"m what means "return null" then normally you get null as result.
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