nested query problem

Hi:

I'm having trouble with this query...

select sr.sqf_id, sr.status, fse.perl_sub_name, fse.end_datetime

  from 

    sqf_runs sr,

    (select perl_sub_name, end_datetime from flow_step_events_view where sqf_id = sr.sqf_id order by 2 limit 1) fse

  where sr.userid='foo';