Keabsahan Hukum Akta Perjanjian Pengikatan Jual Beli Dan Akta Kuasa Menjual Yang Dibuat Di Hadapan Notaris Tanpa Diketahui Pemilik Objek (Studi Putusan Pengadilan Negeri Surabaya Nomor 567/Pdt.G/2023/PN.Sby) = Legal Validity of Deeds of Sale and Purchase Agreements and Deeds of Power of Attorney to Sell Made Before a Notary Without the Knowledge of the Object Owner (Study of Surabaya District Court Decision Number 567/Pdt.G/2023/PN.Sby)