Tesis ini membahas tumpang tindih kepemilikan atas satu bidang tanah dan pembatalansalah satu sertipikat yang berdasarkan kepemilikan yang tidak sah yang terjadi padaPutusan No. 9/Pdt.G/PN.Mrs. Penelitian ini dilatarbelakangi atas keingintahuanmengenai perlindungan hukum bagi pihak pembeli yang menderita kerugian ataspembelian tanah yang berdasar pada kepemilikan yang tidak sah. Dari latar belakangtersebut muncul permasalahan penelitian untuk mengidentifikasi pertimbangan hakimdalam pembatalan Akta Jual Beli, menganalisis upaya hukum pihak pembeli yangmengalami kerugian atas pembatalan Akta Jual Beli, serta menganalisis tanggung jawabPPAT terhadap batalnya Akta Jual Beli. Metode penelitian yang digunakan dalampenelitian ini adalah penelitian hukum normatif. Adapun analisis menggunakanpendekatan kualitatif. Tipologi penelitian adalah diagnostic-deskriptif analitis. Hasilpenelitian bahwa berdasarkan pertimbangan hakim Sertipikat yang dinyatakan bataladalah Sertipikat Hak Milik No. 01/Desa Sudirman dikarenakan terdapat cacat hukumdalam proses penerbitan sertipikat tersebut yaitu dalam proses pengukuran tidak diketahuioleh pemerintah Desa dan tidak terdapat pengumuman. Dapat dimungkinkan terbitnyasertipikat ganda oleh Kantor Pertanahan dikarenakan salah penetapan batas, yang manaKantor Pertanahan pada saat melakukan pengukuran tanah tidak mengonfirmasi batasbatasdesa dari Pemerintah Desa setempat. Hal demikian terjadi karena tidak adanyakoordinasi antara instansi Kantor Pertanahan dengan instansi Pemerintah Desa.Selanjutnya pembeli yang mengalami kerugian dapat meminta ganti rugi secara hukummelalui litigasi maupun non litigasi. Kemudian PPAT wajib memikul tanggung jawabadministratif dan perdata atas ketidakabsahan akta jual beli yang ditandatangani olehnya,yang mana sanksi yang diterima PPAT yaitu pengembalian biaya pembuatan akta kepadapihak yang mengalami kerugian.

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This thesis discusses about overlapping ownership of one plot and the cancellation of a

certificate based on unauthorized ownership that occurred in court decision Number

9/Pdt.G/PN.Mrs. This research is based on curiosity about legal protection for the buyer

who suffers losses on the purchase of land based on unauthorized ownership. From this

background, research problems emerge to identify judges’ considerations in canceling

sale and purchase deed, analyze the legal efforts of the buyer who suffered a loss on the

cancellation of the sale and purchase deed, and analyze PPAT’s responsibility for the

cancellation of the sale and purchase certificate. The research method used in this

research is normative legal research. The analysis uses a qualitative approach. The

typology of the study is analytical-descriptive diagnostic. The result of the research shows

that based on the consideration of the judge, the certificate which was declared canceled

was the certificate of ownership right Number 01 /Sudirman Village, because there is a

legal flaw in the process of issuing the certificate, namely the measurement process is not

known by the Village government and there is no announcement. It may be possible to

issue a double certificate by the Land Office due to the incorrect boundary determination,

in which the Land Office when conducting land measurements did not confirm village

boundaries from the local Village Government. This happens because there is no

coordination between the Land Office and Village Government agencies. Furthermore,

buyers who experience losses can seek legal damages through litigation or non-litigation.

Then PPAT is obliged to assume administrative and civil responsibility for the invalidity

of the sale and purchase deed signed by it, which is the sanction that PPAT receives,

namely the refund of the deed making fee to the party who suffered the loss.