Restriction on transfer.

Notwithstanding anything to the contrary contained in any

other law, or in any contract, custom or usage, or in any judgment, decree or order of any court, any transfer effected by a member of a Scheduled Tribe, of immovable property possessed, enjoyed or owned by him, on or after the commencement of this Act to a person other than a member of a Scheduled Tribe, without the previous consent in writing of the competent authority, shall be invalid.