Insert into a clob field in a procedure based form

Hi,
I have a table with a clob field. I wrote a procedure to insert into this table. Then I built a form based on this procedure. Here is my code:
drop table clob_test;
create table clob_test(id NUMBER, note CLOB);
insert into clob_test values(10,empty_clob());
Create or Replace PROCEDURE PROJECTS.SET_CLOB
( p_id IN CLOB_TEST.id%TYPE,
p_note IN VARCHAR2 default null)
as
v_loc CLOB;
v_amt binary_integer;
v_pos integer :=1;
v_clob varchar2(32000);
Begin
insert into clob_test values(p_id,empty_clob());
v_clob := p_note;
v_amt := LENGTH(v_clob);
select note into v_loc from clob_test where id = p_id;
DBMS_LOB.WRITE(v_loc,v_amt,v_pos,v_clob);
End;
When I try to insert into note field more than 4000 charaters. I got this error:
An unexpected error occurred: ORA-06502: PL/SQL: numeric or value error: character string buffer too small (WWV-16016)
Why this happens? I know portal form doesn't support clob, but this procedure deal directly with database. Can anyone from Oracle give me help? Thanks in advance!

I use a dynamic page instead of a form on the procedure. It's working.
Apparently Oracle is not supporting a varchar2 more than 4000 in any form format, even using textarea for p_note.

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