Coupons cannot be manually edited after creation on some server versions - must delete and recreate Cannot apply multiple coupons to one order - only one coupon per order allowed Usage history is lost when coupon is deleted - no soft delete or archive feature Product restriction limited to one product per coupon; for multi-product promotions, create separate coupons Client restriction limited to one client; for multi-client promotions, create separate coupons No built-in reporting on coupon effectiveness or ROI - usage count only Coupon codes are case-sensitive when entered by customers at checkout Portal server must be accessible for coupon validation; if unavailable, all coupons fail validation