Restrictions on revocation of immovable property transfer agreements bar alteration or transfer until purchase orders lapse or are abrogated. The provision prohibits any person from revoking or altering an agreement for transfer of immovable property or transferring such property where a prescribed statement has been furnished, unless the statutory purchase order by the Central Government has not been made and the period for making it has expired, or a made purchase order has been abrogated; any transfer in contravention is void.