Newbie question on RULEs .. or .. bug ?

Hello,

I have been working with a great database system called PostgreSQL for
many years ;-) but never had to use any RULEs. I now have to use and
update through a view and have written a few rules to make this possible
as per the manual.

My insert rules seems to work fine, but I can't make the update rule do
what I want and as I believe stated in the manual.

In the attached schema I have 2 basic tables and a view combining
those. I have 2 rules for insert on the view and these works fine. The
update rule, however, doesn't do what I want. The manual states that the
origsal query tree (where) is added to the rule qualification,
so I would exspect the update statement below would only update 1 row of
the ganntinfo table, but it updates all 5 ?

What am I doing wrong ?

projtaskdb=# SELECT * FROM ganntinfo ;
id | seq | category | name
-----+-----+----------+---------
46 | 0 | SRC | 2WWE
172 | 0 | SRC | RKD60
138 | 0 | SRC | Diverse
34 | 0 | SRC | VF
87 | 0 | SRC | 2WWE
(5 rows)

projtaskdb=# UPDATE tasks SET id = 87, category = 'SRC', name = '2WWE',
customer = 'Custm', description = 'test' WHERE id = 87 and category =
'SRC';
UPDATE 5
projtaskdb=# SELECT * FROM ganntinfo ;
id | seq | category | name
----+-----+----------+------
87 | 0 | SRC | 2WWE
87 | 0 | SRC | 2WWE
87 | 0 | SRC | 2WWE
87 | 0 | SRC | 2WWE
87 | 0 | SRC | 2WWE
(5 rows)

projtaskdb=#

I tried to put an 'explain' in front of the update within the update
rule, but got a syntax error. Why is that ?

Please help,

Leif