Update two tables (multiple tables) associated update -- the modified value is calculated from another table

UPDATE trd_sess A
SET    A.rec_updt_la_dt_tm = SYSDATE,
       A.trd_sess_end_tm = (SELECT B.trd_sess_end_tm
                            FROM   trd_sess B
                            WHERE  B.prod_type = 'LEQU'
                                   AND B.wkdy_tdy_cde = A.wkdy_tdy_cde
                                   AND B.trd_sess_cde = A.trd_sess_cde
                                   AND B.trd_sb_sess_cde = A.trd_sb_sess_cde
                                   AND B.grp_prod_type_prim_cde =
                                       A.grp_prod_type_prim_cde)
WHERE  A.prod_type = 'ZZZZ'
       AND A.wkdy_tdy_cde IN ( 1, 2, 3, 4, 5 )
       AND A.trd_sess_cde = 'AFTMTH'
       AND A.trd_sb_sess_cde = 'SESS01'
       AND A.grp_prod_type_prim_cde = 'L';