2.In case of sale using a contract clause in accordance with Article 20 of Delegated Regulation (EU) No 639/2014, the buyer shall in his first application for payment under the basic payment scheme include details of the sales contract indicating the relevant contract clause and/or, where required by the Member State, a copy of that sale contract. Such application shall be submitted in the same year as the application for the allocation of payment entitlements referred to in Article 4 of this Regulation.