Kesalahan akibat keberpihakan notaris dalam melakukan pembuatan akta perjanjian pengikatan jual beli (studi putusan majelis pemeriksa pusat notaris nomor 19/B/MPPN/XII/20017) = Fault due to notary's alignments in making deed of buy sell agreement fastening (study of decision of the central supervisory council of notaries number 19/B/MPPN/XII/2017) / Annafi'u Khoiriyyah