BUG #2431: Error:SELECT query has no destination for result data

The following bug has been logged online:

Bug reference:      2431
Logged by:          bhavani
Email address:      pavuluribhavani@yahoo.co.in
PostgreSQL version: postgresql 8.10
Operating system:   windowsxp
Description:        Error:SELECT query has no destination for result data
Details:

CREATE OR REPLACE FUNCTION insert_adv_exrate(IN comp_id int4, IN advid int4,
IN currid1 int4, OUT exid int4, OUT exrate float8) RETURNS record
AS $$
/*$BODY$*/
 declare currid integer;
 get_exdetails refcursor;
  begin
  select exid=max(ex_id) from adv_exrate where comp_id=comp_id and
adv_id=advid ;

  if(coalesce(exid,0)=0) then
    exid:=1;
 else
    exid:=exid+1;
END if;

open get_exdetails FOR

select curr_id,exchange_rate from curr_master where comp_id=comp_id;

  LOOP
   FETCH get_exdetails into currid,exrate;

  IF  NOT FOUND THEN
        EXIT;  -- exit loop
    END IF;


   insert into adv_exrate values(exid,comp_id,advid,currid,exrate);

END LOOP;

 CLOSE get_exdetails;


select exrate=exchange_rate from curr_master where  comp_id=comp_id and
curr_id=currid1;

end;

/*$BODY$*/
 $$ LANGUAGE 'plpgsql' VOLATILE;
ALTER FUNCTION insert_adv_exrate(IN comp_id int4, IN advid int4, IN currid1
int4, OUT exid int4, OUT exrate float8) OWNER TO postgres;

----------------------------------------------------------------------------
-------------------------------------------------------------


CREATE OR REPLACE FUNCTION insert_adv_exrate(IN comp_id int4, IN advid int4,
IN currid1 int4, OUT exid int4, OUT exrate float8) RETURNS record
AS $$
/*$BODY$*/
 declare currid integer;
 get_exdetails refcursor;
  begin
  select exid=max(ex_id) from adv_exrate where comp_id=comp_id and
adv_id=advid ;

  if(coalesce(exid,0)=0) then
    exid:=1;
 else
    exid:=exid+1;
END if;

open get_exdetails FOR

select curr_id,exchange_rate from curr_master where comp_id=comp_id;

  LOOP
   FETCH get_exdetails into currid,exrate;

  IF  NOT FOUND THEN
        EXIT;  -- exit loop
    END IF;


   insert into adv_exrate values(exid,comp_id,advid,currid,exrate);

END LOOP;

 CLOSE get_exdetails;


select exrate=exchange_rate from curr_master where  comp_id=comp_id and
curr_id=currid1;

end;

/*$BODY$*/
 $$ LANGUAGE 'plpgsql' VOLATILE;


      i am using the above procedure in postgre sql.
theprocedure is execting successfully.but when i am giving select
insert_adv_exrate(222222222,1,2); it is giving error as


ERROR:  SELECT query has no destination for result data
HINT:  If you want to discard the results, use PERFORM instead.
CONTEXT:  PL/pgSQL function "insert_adv_exrate" line 5 at SQL statement


How can i solve this problem