Commonwealth Consolidated Regulations(1) Where a person who is not a party:
(a) ought to have been joined as a party; or
(b) is a person whose joinder as a party is necessary to ensure that all matters in dispute in the proceeding may be effectually and completely determined and adjudicated upon;
the Court may order that the person be added as a party and make orders for the further conduct of the proceeding.
(2) A person shall not be added as an applicant without the person's consent.