ORDER BY custom type

CREATE TYPE PERSONTYPE AS
(    id        BIGINT,    firstname VARCHAR,    lastname  VARCHAR,    initials  VARCHAR
);

SELECT act.entity_id AS project_id, act.name AS project    , (SELECT ROW(p.entity_id, p.firstname, p.lastname, p.initials)::persontype        FROM onp_crm_person p        WHERE act.responsible = p.onp_user_id) AS responsible_person
from onp_crm_activity act
ORDER BY responsible_person ASC
;

SELECT act.entity_id AS project_id, act.name AS project    , (SELECT ROW(p.entity_id, p.firstname, p.lastname, p.initials)::persontype        FROM onp_crm_person p        WHERE act.responsible = p.onp_user_id) AS responsible_person
from onp_crm_activity act
ORDER BY responsible_person.initials ASC
;