insert rows into view

how can i insert/update/delete a row into a view?
i read in the manual that i have to use a rule for the
table, but for me it is not working.

here are the codes for the view, and the rule:
DROP VIEW plant_unit_view;
CREATE VIEW plant_unit_view AS SELECT * FROM
plant_unit;

DROP RULE plant_unit_rule;
CREATE RULE plant_unit_rule AS
ON INSERT TO plant_unit
DO INSTEAD INSERT INTO plant_unit
(pu_code, pu_name, unit_id, pu_type,
job_id, mod_user, mod_date)
VALUES
(new.pu_code, new.pu_name, new.unit_id,
new.pu_type, new.job_id, new.mod_user, new.mod_date);

Ivan

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