Sch FOURTH para 3
Subject to the provisions of the last foregoing paragraph, the order, or the approval of the plan, shall not be questioned in any legal proceedings whatsoever, either before or after the order is confirmed or the approval is given, as the case may be, and shall become operative at the expiration of six weeks from the date on which notice of confirmation of the order, or of the approval of the plan, is published in accordance with the provisions of this Act.