It states about termination of business with the product partner if a violation of the Code of Conduct is found. Therefore, the code of conduct is included in the suppliers' contract.
pg. 3
“Corrective Action
When violations are found, FAST RETAILING and the production partner will agree on a corrective action plan that eliminates the problem within a reasonable timeframe. If it is found that a production partner is in violation of this code of conduct, FAST RETAILING will take actions, which may include immediate cancellation of orders and/or termination of business with the production partner.”