Problem with SET CONSTRAINTS ALL DEFERRED;

Hi Friends,

I am trying to postpone the foreign key constraint check till the end of
transaction but it doesn't work.
Can anyone help me with a tip what I am doing wrong.

Thanks in advance.

Kaloyan Iliev

test=# BEGIN;
BEGIN
test=#
test=# SET CONSTRAINTS ALL DEFERRED;
SET CONSTRAINTS
test=# DELETE FROM picture
test-# USING
element_picture
test-# WHERE
picture.id = element_picture.picture_id
test-#
AND element_picture.element_id = 8;
ERROR: update or delete on "picture" violates foreign key constraint
"picture_id" on "element_picture"
DETAIL: Key (id)=(223) is still referenced from table "element_picture".

select version();
version
------------------------------------------------------------------------------------------------
PostgreSQL 8.1.2 on i386-portbld-freebsd6.0, compiled by GCC cc (GCC)
3.4.4 [FreeBSD] 20050518
(1 row)