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 the Scheduled Tribe, of land 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.