Partitioning...

Hi listers,
I am trying to learn PG partioning (constaraint exclustion).
I have created pretty simple table (all the code is below), but when I try to populate
The table with data, the RULE system is not working as expected (e.g. as I have expected).
The code:

-------------------------------------------
CREATE TABLE part (
id1 int not null,
id2 int not null,
filler varchar(200)
);

create table part_id1_0_10 ( CHECK ( id1>= 0 and id1<=10) ) INHERITS (part);
create table part_id1_11_20 ( CHECK ( id1>=11 and id1<=20) ) INHERITS (part);

CREATE INDEX idx_part_id1_0_10 ON part_id1_0_10(id1);
CREATE INDEX idx_part_id1_11_20 ON part_id1_11_20(id1);

CREATE RULE part_id1_0_10_insert AS ON INSERT TO part
WHERE ( id1>= 0 and id1<=10 )
DO INSTEAD INSERT INTO part_id1_0_10 VALUES ( NEW.id1, NEW.id2, NEW.filler);

CREATE RULE part_id1_11_20_insert AS ON INSERT TO part
WHERE ( id1>=11 and id1<=20 )
DO INSTEAD INSERT INTO part_id1_11_20 VALUES ( NEW.id1, NEW.id2, NEW.filler);

analyze part_id1_0_10 ;
analyze part_id1_11_20 ;

CREATE VIEW part_all AS
select * from part_id1_0_10
UNION ALL
select * from part_id1_11_20
;

postgres=# \d+ part
Table "public.part"
Column | Type | Modifiers | Description
--------+------------------------+-----------+-------------
id1 | integer | not null |
id2 | integer | not null |
filler | character varying(200) | |
Rules:
part_id1_0_10_insert AS
ON INSERT TO part
WHERE new.id1 >= 0 AND new.id1 <= 10 DO INSTEAD INSERT INTO part_id1_0_10 (id1, id2, filler)
VALUES (new.id1, new.id2, new.filler)
part_id1_11_20_insert AS
ON INSERT TO part
WHERE new.id1 >= 11 AND new.id1 <= 20 DO INSTEAD INSERT INTO part_id1_11_20 (id1, id2, filler)
VALUES (new.id1, new.id2, new.filler)
Has OIDs: no

-------------------------------------------

When I try :
insert into part(id1, id2, filler)
select
round( (random()*10)::bigint,0) as id1,
round( (random()*20)::bigint,0) as id2,
'TTTTTTTTTTTESTTTTTZZZZZZZZZZZZZZZZZZZ'
from generate_series(0,100000);

All the data is redirected to part_id1_0_10 (as expected).
But When I issue:
insert into part(id1, id2, filler)
select
round( (random()*20)::bigint,0) as id1, <---!!! Note that both partitions should be populated!
round( (random()*20)::bigint,0) as id2,
'TTTTTTTTTTTESTTTTTZZZZZZZZZZZZZZZZZZZ'
from generate_series(0,100000);

I am getting :

ERROR: new row for relation "part_id1_0_10" violates check constraint "part_id1_0_10_id1_check"

How to fix the problem ? I thought that the rules were enough to redirect to records to
The right partions. Should I use triggers instead. The documentation is saying that can use either
Rules OR triggers:
http://www.enterprisedb.com/documentation/ddl-partitioning.html

Point 5 in 4.10.2. Implementing Partitioning.

Any suggestions ?

Many thanks in advance
Milen