problem with foreign keys

Hi,i have a problem with REFERENCES (foreign keys). i have this table:

drop table paragraph;
create table paragraph (id int4  PRIMARY KEY,label varchar(512),paragraph_next int4 CONSTRAINT paragraph_fk_next
REFERENCESparagraph DEFERRABLE INITIALLY DEFERRED,paragraph_priv int4 CONSTRAINT paragraph_fk_priv REFERENCES paragraph
DEFERRABLEINITIALLY DEFERRED
 
);
if a excute this statements a recive a CONSTRAINT probleme:



begin;
insert into paragraph values (1,'par1',null,null);
insert into paragraph values (2,'par2',null,1);
update paragraph set paragraph_next = 2 where id = 1;
end;

and then:

begin; 
delete from paragraph;
insert into paragraph values (1,'par11',null,null);
insert into paragraph values (2,'par22',null,1);
update paragraph set paragraph_next = 2 where id = 1;
end;                         

i recive:
ERROR:  paragraph_fk_next referential integrity violation - key in paragraph still referenced from paragraph

Regards,

----
Malek Shabou                    E-mail: Malek.Shabou@nic.fr
AFNIC France                    Tel: +33 1 39 63 50 15
c/o INRIA-Rocquencourt Domaine de Voluceau  Fax: +33 1 39 63 55 34 
B.P.105 78153 Le Chesnay Cedex