Section 15. Dealings with settled estate to the prejudice of successors prohibited

15. Except as otherwise provided by this Act, no person entitled to a settled estate shall have power to transfer, dispose of, alienate, convey, charge, encumber or lease the same or any part thereof, or the profits thereof, for any greater or larger interest or time than during his life, nor shall a settled estate, or any part thereof, or the profits thereof, be held by any court to be or to have vested in such person for any larger or greater interest or time than for his life.