Overview

Amazon’s validation error 100720 appears when a seller’s product feed contains language data that does not align with the target marketplace’s required language. The mismatch blocks the listing from going live, so any seller managing cross‑border inventories must correct the language fields before the feed can be processed.

Key Points

• Marketplace‑specific language rule — Every Amazon store expects product content in its primary language (e.g., German for amazon.de, Japanese for amazon.co.jp); submitting English text to a non‑English store triggers the error.
• Attribute‑level detection — The system pinpoints the exact fields (title, bullet points, description, etc.) that contain the offending language, allowing sellers to see precisely where the problem lies.
• Bulk‑upload vulnerability — When using flat‑file templates or API calls, a single misplaced language code can affect dozens of SKUs across multiple regions in one submission.
• Incomplete language tags — Missing or partially filled language identifiers (such as an empty “language” column in a spreadsheet) are treated as mismatches and cause the same validation failure.
• Impact on multi‑marketplace strategy – Sellers who duplicate a single English‑only listing across several stores without localized content see a higher incidence of error 100720, slowing international expansion.
• Resolution deadline — Amazon will not process the feed until the language discrepancy is fixed, which can add 24–48 hours of delay to a product’s launch schedule.

How to Resolve Error 100720

1. Read the error details — Open the feed error report; note the marketplace identifier (e.g., A1PA6795UKMFR9 for Germany) and the listed attributes that failed validation.
2. Match the marketplace language — Replace the flagged English text with the required language; for a German marketplace, rewrite the title “Stainless Steel Water Bottle” as “Edelstahl‑Trinkflasche”.
3. Insert the correct language code — In the flat‑file column labeled “language”, enter the ISO‑639‑1 code that corresponds to the marketplace (e.g., de for German, ja for Japanese).