EN
Article 70[5] of the Civil Code gives an opportunity to invalidate a contract which was concluded as a result of a faulty tender or an auction, when someone affected a result of the tender or the auction contrary to a law or a a good will. There are three types of problems connented with the article 70[5] of the Civil Code. First: is the formulation of the article 70[5] proper? Second: is a range of an usage of article 70[5] accurate? Finally, third: is an invalidity of the contract an effective and proportional sanction? The article attempts to give an answer to foregoing questions.