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I have coupon that validate if a minimum order amount is reached. I used a new field and a rule, it works ok in checkout, but after redeem the coupon, the user can change product quantity (in other browser tab) and the validation doesn't be called again. I tried to delete coupons in order when line items changed but the order doesn't have coupons referenced in that instance (Event: Line items add/update/delete). Can you tell me how we can ensure the cart isn't changed after coupon is added or delete coupons if cart changes.