SELECT B.USER_NAME CREATOR_USER_NAME , C.USER_NAME SUPERVISOR_USER_NAME FROM PER_ASSIGNMENTS_F A , FND_USER B , FND_USER C WHERE A.PERSON_ID = B.EMPLOYEE_ID AND A.SUPERVISOR_ID= C.EMPLOYEE_ID AND 'HRMS' = (SELECT MEANING FROM GEM_LOOKUPS WHERE LOOKUP_TYPE='IC_ITEM_HIERARCHY' AND LOOKUP_CODE='1') GROUP BY B.USER_NAME , C.USER_NAME UNION SELECT CREATOR_USER_NAME , SUPERVISOR_USER_NAME FROM IC_ITEM_HIERARCHY WHERE 'OPM' = (SELECT MEANING FROM GEM_LOOKUPS WHERE LOOKUP_TYPE='IC_ITEM_HIERARCHY' AND LOOKUP_CODE='1')