Adjust the mandatory cancellation time of cotton warehouse receipt to n+ 1 10/5 trading days.

Modifying the validity period of the cotton futures warehouse receipt can ensure that all the cotton used in the contract delivery of 5438+ 10 will be produced in the new year, effectively solve the problem of cotton mixing during the contract delivery of 5438+ 10, and highlight the representativeness of the contract price of 5438+ 10. At the same time, shortening the validity period of warehouse receipts is conducive to reducing the time of warehouse receipts, reducing the backlog of aged cotton and improving the safety of delivery and storage.