Here are two orders created:
first (promo code worked here):
https://b2bhub.crm-onebox.com/admin/customorder/order/23318/edit/and the second one (promo code didn't work here):
https://b2bhub.crm-onebox.com/admin/customorder/order/23319/edit/Import orders from PROM do "Automatic actions once a minute":
PromUA / Import orders from XML
there is a checkmark in the settings: If a promotional code is used in the order - add it to the system and to the process (with a negative price)
in coupons in ONEBOX coupon number 93 worked
https://b2bhub.crm-onebox.com/admin/shop/coupon/ this is for the first order, and nothing happens for the second
On PROM, here is the promo code (two uses recorded)
No matter how many pieces you create, one will still work in ONEBOX.