It explicitly states about cancellation of orders if the supplier has violated the code of conduct, hence the code of conduct is included in the supplier contract.

pg. 3

"Improvement actions. If a supplier partner is found to have violated this Code of Conduct, SHEIN will have the right but not the obligation to negotiate a remediation plan with the supplier partner to resolve the violation within a reasonable period of time. If the supplier partner fails to remediate within a reasonable time or refuses to rectify after receiving the remediation notice from SHEIN, SHEIN has the right to unilaterally cancel the order and/or immediately terminate all business cooperation with the supplier partner, and the company should not, as a result of the aforementioned cancellation of orders or termination of cooperation, be liable for any form of breach of contract, infringement or damages."