(1) A person who, when making a declaration of intent, was mistaken about its contents or had no intention whatsoever of making a declaration with this content, may avoid the declaration if it is to be assumed that the person would not have made the declaration had they been aware of the factual position and had they had a sensible understanding of the case.
(2) A mistake about such characteristics of a person or a thing as are regarded as essential in business dealings also is deemed a mistake about the content of the declaration.