Pembatalan Perjanjian Pengikatan Jual Beli Unit Satuan Rumah Susun dan Perlindungan Hukum Terhadap Calon Pembeli Yang Telah Melaksanakan Kewajibannya (Studi Kasus Putusan Nomor 880 K/Pdt/2022 Jo. Putusan Nomor 524/Pdt.G/2019/PN Jkt.Sel) = Cancellation of the Sale and Purchase Contract of Flats Units and Legal Protection of Prospective Buyers who have carried out their obligations (Case Study of Decision Number 880 K/Pdt/2022 Jo. Decision Number 524/Pdt.G/2019/PN Jkt.Sel)