Peran dan Tanggung Jawab Notaris Terhadap Akta Perjanjian Pengikatan Jual Beli Disertai Akta Kuasa Menjual yang Dibatalkan oleh Putusan Pengadilan Tinggi Surabaya (Studi Putusan Nomor 135/PDT/2020/PT SBY) = Roles and Responsibilities of Notaries to the Deed of Sale Binding Agreement Purchase Accompanied by Deed of Power of Attorney to Sell Canceled by Court Decision (Study of Decision Number 135/PDT/2020/PT SBY)