SELECT 'X' 
FROM PS_INSTALLATION
WHERE EXISTS 
(
	SELECT *
	FROM PS_KK_SOURCE_LN A
	WHERE A.<something> = PS_INSTALLATION.<something>
		AND A.LINE_NBR = '1'
		AND A.SCHED_NBR = '1' 
		AND A.DISTRIB_LINE_NUM = '1'
		AND EXISTS
		(
			SELECT *
			FROM PS_KK_SOURCE_HDR B
			WHERE A.KK_TRAN_ID = B.KK_TRAN_ID
				AND A.KK_TRAN_DT = B.KK_TRAN_DT
				AND B.BUSINESS_UNIT = 'BUS'
				AND B.PO_ID = 'PO_NUM'
		)
		AND EXISTS
		(
			SELECT *
			FROM PS_KK_ACTIVITY_LOG C
			WHERE A.KK_TRAN_ID = C.KK_TRAN_ID
				AND A.KK_TRAN_DT = C.KK_TRAN_DT
				AND A.KK_TRAN_LN = C.KK_TRAN_LN
				AND C.ENTRY_EVENT <> ' '
				AND C.EE_PROC_STATUS IN ('N', ' ')
		)
)