(1)Subject to the provisions of this Act, the Authority for Advance Rulings constituted under section 245-O of the Income-tax Act, 1961 shall be [the Appellate Authority for deciding appeal under this Chapter and the said Appellate Authority] shall exercise the jurisdiction, powers and authority conferred on it by or under this Act:Provided that the Member from the Indian Revenue Service (Customs and Central Excise), who is qualified to be a Member of the Board, shall be the revenue Member of the [Appellate Authority] [Substituted 'Authority' by Finance Act, 2018 (Act No. 13 of 2018), dated 29.3.2018.] for the purposes of this Act.