2.3. Verbal orders placed with Pro+Motion GmbH by contract partners in the cases under 2.1. and 2.2., other agreements and subsidiary agreements as well as subsequent amendments to the contract will never be binding on Pro+Motion GmbH unless these have been confirmed in writing by Pro+Motion GmbH and/or the services on which such agreements are based are actually performed by Pro+Motion GmbH. In the latter case, the scope of performance will be determined by the services actually performed by Pro+Motion GmbH.