function is not updating

-- Function: mf_finalize_run(integer, integer, character varying, integer, integer)
 
-- DROP FUNCTION mf_finalize_run(integer, integer, character varying, integer, integer);
 
CREATE OR REPLACE FUNCTION mf_finalize_run(integer, integer, character varying, integer, integer)
  RETURNS integer AS
'
declare
   ijob_id alias for $1;
   iset_id alias for $2;
   svgroup alias for $3;
   iotype alias for $4;
   iruntype_id alias for $5;
   
begin
   -- Check that we have valid arguments
   if (ijob_id is null) or (iset_id is null) or (svgroup is null) or (iotype is null) or (iruntype_id is null) then
      raise exception ''None of the arguments can be null'';
   end if;
 
   -- Make the run available
   update run_u set status = ''available''
      where vgroup = ''svgroup'' and job_id = ijob_id and runtype_id = iruntype_id;
 
   -- Link the runlink to the set
   update runlink_u set id_val = iset_id
      where tbl_otype = iotype and vgroup = ''svgroup'' and id in (
         select rl.id from run r
         inner join runlink rl on r.id=rl.run_id
         where rl.vgroup = ''svgroup'' and r.job_id = ijob_id and rl.tbl_otype = iotype
      );
 
   -- Time stamp the run
   update run_u set finish=now()
      where job_id = ijob_id and runtype_id = iruntype_id and job_vgroup = ''svgroup'';
 
   update run_u set failed=false
      where job_id = ijob_id and runtype_id = iruntype_id and job_vgroup = ''svgroup'';
	
   -- Mark run as finished
   update run_u set status = ''finished''
      where job_id = ijob_id and runtype_id = iruntype_id and job_vgroup = ''svgroup'';
 
   return 1;
end;
'
  LANGUAGE 'plpgsql' VOLATILE;