Function Parameter Problem

Hi Every Body,

i'v finished creating function generate_sjno(str_no
char(12), int_reset int2).
when it called an error message raised, this is the
illustration:

baisdb=> select generate_sjno('20060130',6);
ERROR: function generate_sjno("unknown", integer)
does not exist
HINT: No function matches the given name and argument
types. You may need to ad
d explicit type casts.

my questions :

1. is always char become bpchar on function
declaration?
2. is any missing on my function?
3. thanks all.

this my function declaration :

CREATE OR REPLACE FUNCTION generate_sjno(str_no
bpchar, int_reset int2)
RETURNS bpchar AS
$BODY$
declare
stran char(12);
srsj char(4);
begin
select into stran max(substr(tranno,9,4)) from
tran_hd where substr(tranno,1,int_reset)=str_no;
if found then

srsj:=lpad(((trim(stran)::int2)+1)::varchar(4),4,'0');
else
srsj:='0001';
end if;
stran:=substr(str_no,1,8) || srsj;
return stran;
end;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;

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