Tanggung jawab notaris terhadap cacat yuridis akta perjanjian kerja sama. Studi kasus putusan Majelis Pengawas Wilayah Notaris Nomor:02/Pts/Mj/Pwn.Prov.Riau/XI/2012 = Notary's responsibility towards juridical defect of the cooperation deed. Case study on the region supervisor council Nomor:02/Pts/Mj/Pwn.Prov.Riau/XI/2012