Function error

Dear PostgreSQL enlightened ,

I have an error with this function can anyone suggest me what stupid
thing am i doing

<code>
create type_a as (mnthtot numeric(20,2),monthtxt varchar(20));

CREATE OR REPLACE FUNCTION "public"."func_ca" () RETURNS "public"."type_a" AS'
DECLARE
f_type_a type_a%ROWTYPE;
f_data record;
f_year int8;
f_month int8;
BEGIN
f_year := 2004 ;--hard coded for year 2004-2005
f_month := 4 ;--hard coded for year 2004-2005
f_type_a.mnthtot := 0;-- Month total
f_type_a.monthtxt:= ''MONTH''::varchar;-- Month text
for f_data IN select sum(cust_wdrwl_amt) as total,4 as month from
cust_lon_dtls where (select extract(MONTHS from
cust_lon_dtls.curr_rn_dt)) = f_month AND (select extract(YEARS from
cust_lon_dtls.curr_rn_dt)) = f_year
LOOP
f_type_a.mnthtot := f_data.total;
f_type_a.monthtxt := (f_data.month || ''MONTH'')::varchar;
f_month := f_month + 1;
IF f_month = 13 THEN
f_month := 1 ;
f_year := 2005;
elsif f_month = 5 AND f_year = 2005 THEN
return f_type_a;
END IF;
END LOOP;
return f_type_a;
END;
'LANGUAGE 'plpgsql' VOLATILE CALLED ON NULL INPUT SECURITY INVOKER;
</code>


The error is

somedata =# select sai_func_ca();
ERROR:  cannot display a value of type record




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