11. After section 20 of the Principal Act the following section is inserted:
“20A. (1) The Tribunal may, of its own motion or on application by a party, request the President to reconstitute the Tribunal to give a ruling on a question of law or on a question that, in the opinion of the requesting Tribunal, is a question of law.
“(2) Where the Tribunal reconstituted in accordance with a request under subsection (1) gives a ruling on a question of law (including the question whether a particular question is a question of law), the requesting Tribunal is bound by the ruling.
“(3) The question of whether a particular question is one of law shall be decided in accordance with the opinion of the Tribunal reconstituted in accordance with a request under subsection (1).
“(4) A Tribunal reconstituted in accordance with a request under subsection (1) shall be constituted by 1 or more of the following:
(a) the President;
(b) the Deputy President;
(c) a senior member who is enrolled as a legal practitioner of the High Court, of another federal court, of the Supreme Court or of the Supreme Court of a State or of another Territory who has been so enrolled for not less than 5 years.
“(5) Nothing in this section limits the President's power to reconstitute the Tribunal under section 20.”.