Overview

Error 100403 is a listing submission error that Amazon sellers encounter when product attributes are submitted in a language that doesn't match the approved language for their marketplace. When triggered, Amazon suppresses the attribute value in question, which can prevent listings from going live or cause missing product information. Understanding how to resolve this error is essential for sellers operating across multiple Amazon marketplaces or working with international product data.

Key Points / What Sellers Need to Know

• Language-specific marketplaces — Each Amazon store has a set of approved languages for product listings, and all submitted attributes must conform to these language requirements.
• Attribute suppression — When an attribute is submitted in an unsupported language, Amazon does not simply reject the listing outright. Instead, it suppresses the specific attribute value, which can lead to incomplete or missing product details on your listing page.
• Brand names must match marketplace language — Even brand names need to be provided in the accepted language for the store. Submitting a brand name in characters or scripts from another language will trigger this error.
• Bulk upload vulnerability — Sellers using listing templates or flat files are especially susceptible to this error, particularly when managing inventory across multiple international marketplaces.

What Causes Error 100403

This error is triggered in two primary scenarios. The first occurs when a seller attempts to submit a listing template in a language that has not been approved for their particular Amazon store. For example, uploading a product feed with Japanese text to the Amazon US marketplace would trigger this error. The second scenario involves submitting individual attribute values in an unsupported language, even if the rest of the listing is in the correct language. A common example is providing a brand name in non-Latin characters — such as Cyrillic, Chinese, or Greek script — when the marketplace requires the Latin-alphabet version. Amazon expects all attribute values, including brand names, to be provided in the store's accepted language rather than in their native script.