107. (1) The Minister may appoint a person to act as a member—
(a) during a vacancy in the office of the member, whether or not an appointment has previously been made to the office; or
(b) during any period, or during all periods, when the member is absent from duty or from the Territory or is, for any reason, unable to perform the duties of the office;
but a person appointed to act during a vacancy shall not continue so to act for more than 12 months.
(2) Anything done by or in relation to a person purporting to act under subsection (1) is not invalid on the ground that—
(a) the occasion for the person's appointment had not arisen;
(b) there is a defect or irregularity in connection with the person's appointment;
(c) the person's appointment had ceased to have effect; or
(d) the occasion for the person to act had not arisen or had ceased.