Query to find - Is an employer also a buyer or not in oracle Apps or How can check that employee is a buyer

Query to find Is an employee also a buyer or not In Oracle Apps R12 ?

Query -

SELECT pa.agent_id, papf.person_id, papf.employee_number, papf.email_address,
       pa.category_id, pa.location_id, papf.effective_start_date,
       papf.effective_end_date
  FROM po_agents pa, per_all_people_f papf, hr_all_organization_units haou
 WHERE pa.agent_id = papf.person_id
   AND papf.business_group_id = haou.business_group_id
   AND TRUNC (SYSDATE) BETWEEN papf.effective_start_date
                           AND papf.effective_end_date
--AND    email_address = 'rdamanho@redhat.com'
--AND PAPF.EFFECTIVE_END_DATE > SYSDATE
--AND HAOU.BUSINESS_GROUP_ID = 100

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