Dampak Hukum Terhadap Akta Jual Beli Yang Dibuat Berdasarkan Akta Perjanjian Pengikatan Jual Beli dan Akta Kuasa Jual Tanpa Sepengetahuan Pemilik Objek Tanah (Studi Putusan Mahkamah Agung Nomor 1615/K/Pdt/2020) = Legal Impact on the Deed of Sale and Purchase Made Based on the Deed of Sale and Purchase Agreement and the Deed of Power of Sale without the Knowledge of the Owner of the Land Object (Study of Supreme Court Decision Number 1615/K/Pdt/2020)