Even though Exhibit E, an unregistered deed of surrender or release is not in law a valid document capable of transferring any title or estate under the Property and Conveyancing Law, such a document is still enforceable by the court as evidence of an equitable interest of title. Thus, it is admissible to prove payment of a purchase price. This is based under the maxim “Acquitasfactum habet quodfieri oportui ” which means “equity regards as done that which ought to have been done”. Under the rule of equity a purchaser should not be made to lose the land purchased by him merely because the strict legal requirements of registration was not met. [Tewogbade v. Obadina (1994) 4 NWLR (Pt.338) 326; Eso v. Adeyemi (1994) 4 NWLR (Pt340)558; Bello v. Otolorin (1996) 9 NWLR (Pt.470) 49 referred to].
— Adeyemo v. Ida & Ors. (1998) – CA/1/6/92