Case scenario that threatens responsibility as a professional code of conduct

John is a worker in one of the procurement companies known as Blossoms Up. He was assigned at overseeing and evaluating all the procedures and steps of securing a contract from new farms that the company engages business with. In one of the deals, John peruses it and ascertains that all the documentation in it are excellent. However, upon reaching the manager of the company. The manager goes through the documentation and realizes that something crucial is missing. Therefore, from the case scenario, it is evident that the aspect of responsibility is under threat since John our main character entailed with the responsibility of approving availability of all documents and information in a contract denies it and blames someone else. He should accept and take the blame for it is his responsibility.