Advance Ruling mechanism to assume powers under the section from notified date, with provisions applying mutatis mutandis. The amendment provides that, from a date notified by the Central Government, the powers of the Authority under section 245U shall be exercised by the Board for Advance Rulings and the provisions of that section shall apply to the Board mutatis mutandis, effectuating the transfer of authority and application of the section's legal framework to the Board.