When registering a product with the API, an error "The item with the same option and option value as an item exists in duplicate" occurs. 1. Please check if there is no duplicate itemName value for each option in the product creation JSON text. 2. Check if the attributeTypeName and attributeValueName values are entered in the attribute array so that they are not duplicated. Related articles Product Creation The error 'duplicated item name exists' occurs when modifying the product with API. Coupang OPEN API Can I add options to a product registered as a single product (one optional product) through the product modification API? New Product Creation API Guide (changed on October 12, 2020)