Paragraph 6 I1

Notwithstanding paragraphs 1 to 4 of this Article, a contract the subject matter of which is a right in immovable property or a right to use immovable property shall be subject to the mandatory requirements of form of the law of the country where the property is situated if by that law those requirements are imposed irrespective of the country where the contract is concluded and irrespective of the law governing the contract.