UPDATE METRO_FDC.E_L_PROC a
SET (a.EQU_IP, a.TRAV_IP, a.INSERT_DT)= ( 
SELECT b.EQU_IP, b.TRAV_IP, b.INSERT_DT 
FROM TEMP_L_PROC b
WHERE a.LOTO = b.LOTO and
			a.STEP = b.STEP);

UPDATE E_L_PROC a SET 
  (a.EQU_IP, a.TRAV_IP, a.INSERT_DT) = 
  (SELECT b.EQU_IP, b.TRAV_IP, b.INSERT_DT 
   FROM TEMP_L_PROC b
   WHERE a.LOTO = b.LOTO 
     AND a.STEP = b.STEP
  )
WHERE EXISTS (SELECT NULL
               FROM TEMP_L_PROC b
               WHERE a.LOTO = b.LOTO 
                 AND a.STEP = b.STEP
              );