The agreement referred to in Article 22 shall be expressed in writing, dated and signed by both partners. Any communication by electronic means which provides a durable record of the agreement shall be deemed equivalent to writing.

If the law of the Member State in which both partners have their habitual residence at the time the agreement is concluded lays down additional formal requirements for partnership property agreements, those requirements shall apply.

If the partners are habitually resident in different Member States at the time the agreement is concluded and the laws of those States provide for different formal requirements for partnership property agreements, the agreement shall be formally valid if it satisfies the requirements of either of those laws.

If only one of the partners is habitually resident in a Member State at the time the agreement is concluded and that State lays down additional formal requirements for partnership property agreements, those requirements shall apply.