Русско-англо-русский юридический словарь

Mistakes can relate to the subject matter of the contract (error in corpore), the true nature of the contract (error in negotio), the identity of one of the parties to the contract (error in persona) or to an attribute or characteristic of the subject matter of the contract (error in substantia). (MISTAKES IN CONTRACTS – What you need to know. Goldberg & de Villiers Inc.)