Perubahan Data Yuridis dalam Sertipikat Hak Atas Tanah Akibat Akta Jual Beli yang Dinyatakan Batal Demi Hukum (Studi Putusan Pengadilan Negeri Depok Nomor 186/Pdt.G/2020/PN DPK) = Juridical Data Changes in Land Title Certificates Due to a Sale and Purchase Deed Declared Null and Void by Law (Case Study of Depok District Court Decision Number 186/Pdt.G/2020/PN DPK)