The follow-up agreement or the customer`s information that the order is not free of charge or that the order is made on behalf of the recipient or for a third party does not entail the obligation for the customer to bear payments and other expenses. In addition, information relating to the non-free registration of the goods or the fact that the order is on behalf of the recipient or a third party does not contain instructions for receipt. Just as conditions may bind a contractor to a performance obligation, they may also render a contractual agreement inoperative. Explicit terms that do not use certain specific conditions to identify both the agreed event and the date of the event may exempt a contractor from legal liability for an action for breach. .