Implikasi pembatalan akta hibah peralihan hak atas tanah yang dibuat tanpa akta PPAT. Studi kasus putusan Mahkamah Agung Republik Indonesia No 978 K/PDT/2011 = The implications of cancellation the grant deed of transfer of land rights without ppat deed. Case study the supreme court of the Republic of Indonesia decision No 978 K/PDT/2011