Rules

Why is this wrong ?:

DROP SCHEMA test CASCADE ;
CREATE SCHEMA test;

CREATE TABLE test.parent (
id serial PRIMARY KEY,
opis text
);

CREATE TABLE test.child_data (
id serial PRIMARY KEY,
id_parent int ,
podaci text,
FOREIGN KEY (id_parent) REFERENCES test.parent(id)
);

CREATE VIEW test.child AS
SELECT p.id AS id,
p.opis AS opis,
c.id AS id_data,
c.id_parent AS id_parent,
c.podaci AS podaci
FROM
test.parent p, test.child_data c
WHERE c.id_parent = p.id;

CREATE FUNCTION test.testfi(test.child) RETURNS bool AS '
DECLARE
_NEW ALIAS FOR \$1;
BEGIN
RAISE NOTICE ''%'',_NEW.opis;
INSERT INTO test.parent (id,opis) VALUES (_NEW.id,_NEW.opis);
INSERT INTO test.child_data (id,id_parent,podaci) VALUES
(_NEW.id_data,_NEW.id,_NEW.podaci);
RETURN TRUE;
END; '
LANGUAGE 'plpgsql';

CREATE RULE child_ins AS ON INSERT TO test.child
DO INSTEAD SELECT test.testfi(NEW);

INSERT INTO test.child(id,id_data,opis,podaci) VALUES (1,1,'Opis','podaci');

Gives:
(-403)ERROR: cannot handle whole-row reference

Can I pass NEW & OLD from rule into function in any way ?
Any suggestions ?

Regards !