Having regard to the provisions of section 132(1) of the Evidence Act, oral evidence cannot be admitted to contradict, alter, add to or vary a contract or document unless such evidence falls within any of the matters that may be proved by such oral evidence by virtue of the provisos thereto. The provisos only permit evidence which will not be inconsistent with the terms of the relevant contract or document.
– Uwaifo JSC. Fortune v. Pegasus (2004)