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)