Overview

Error 18002 appears when Amazon’s feed processor finds one or more attribute values that do not satisfy the platform’s validation rules. The issue shows up during bulk uploads or inventory file submissions and stops the affected listings from going live. Sellers must address it quickly to avoid inventory delays and missed sales.

Key Points

• Invalid attribute values — The error is triggered when a submitted field contains data outside the allowed range, such as a color value “Neon‑Purple” in a category that only accepts “Purple.”
• Multiple root causes — Common origins include wrong formatting, omitted required fields, mismatched product identifiers, or values that are not on Amazon’s approved list for the specific category.
• Check‑digit failures — Identifiers like ISBN‑13, UPC, or EAN include a calculated check digit; an ISBN entered as 9780306406158 instead of 9780306406157 will cause the error.
• Category‑specific rules — Each Amazon browse node defines its own set of permissible values; a size code “XL” may be valid for apparel but invalid for home‑goods where “Extra‑Large” is required.
• Language tags matter — Fields such as product description or bullet points must include a language code (e.g., “en_US”); omitting the tag leads to a validation failure.
• Bulk‑upload impact — A single malformed row can block an entire feed, preventing dozens or hundreds of ASINs from being created or updated.

How to Resolve Error 18002

1. Download the processing report — Open the feed processing summary in Seller Central; the report lists every row and column flagged as invalid, for example, “Row 27, Column product_type = ‘Electronics‑Gadgets’ (not recognized).”
2. Locate the offending attribute — Use the report’s column reference to find the exact cell in your flat file; if the report cites “UPC 123456789012,” verify that the 12‑digit number follows the GS1 standard and includes a correct check digit.
3. Cross‑check against the category template — Open the latest flat‑file template for the product’s browse node; the “Valid Values” tab shows the accepted entries for each attribute, such as the allowed “material_type” values “Cotton, Polyester, Nylon.” Replace any mismatched entry with one from the list.