Each of your Discounts must have a unique code, the requested code is in conflict with another Discount.
You have attempted to create a Discount using a code already in use.
You have attempted to update a Discount to use a code already in use.
Choose a different Discount code for this request
Update the discount code of the conflicting discount.
Send the Discount code as
nullso that the system creates a new unique a code for the Discount.