How to Fix Error 90004200: Material Composition Percentage Missing in Listings
Error 90004200 blocks listings when the material_type attribute lacks the required "percentage % material" format or totals not equal 100 %. For example, "Cotton" must be changed to "100 % Cotton" or "80 % Cotton, 20 % Polyester" to clear the error.
Overview
Sellers encounter error 90004200 when Amazon’s catalog validation detects missing or improperly formatted material‑composition percentages in a product listing. The issue blocks new listings or updates until the composition field follows Amazon’s strict “percentage + % + material” pattern and totals 100 %. Prompt correction is essential to keep apparel, textile, and home‑goods listings live and sales flowing.
Key Points
- Percentage required for every material — A listing that reads “Cotton” instead of “100 % Cotton” will trigger the error.
- Exact formatting matters — Amazon expects the numeric value, the percent sign, a space, then the material name; any deviation such as “Cotton 100 %” or “100%Cotton” is rejected.
- Each component needs its own share — For blended fabrics, every fabric must have an individual percentage, e.g., “70 % Cotton, 30 % Polyester.”
- Totals must equal 100 % — If the summed percentages are 95 % or 105 %, the validation fails.
- Feed reports pinpoint the problem — The feed processing summary highlights the exact attribute (usually material_type or fabric_content) that caused the error.
How to Fix Error 90004200
- Locate the offending attribute — Open the feed processing summary report, find the row marked with error 90004200, and note the SKU and attribute name (commonly material_type). Example: SKU ABC123 shows “material_type = Cotton” as the fault line.
- Verify the true composition — Consult the product’s label, manufacturer spec sheet, or compliance documentation to obtain the precise material breakdown. Example: The label states the shirt is 80 % Cotton and 20 % Polyester.
- Apply Amazon’s required syntax — Rewrite the attribute value so each material is preceded by its percentage, followed by a percent sign, a space, then the material name, separating multiple entries with commas. Correct entry: “80 % Cotton, 20 % Polyester.”
- Check that percentages sum to 100 % — Add the listed percentages; if they fall short or exceed 100 %, adjust based on the official specification.
Analysis & Recommendations
Why This Matters
The validation error prevents listings from becoming active, halting visibility and sales. In a batch of 5,000 apparel SKUs, up to 200 listings can be rejected, causing downtime of minutes to hours until the feed is corrected and resubmitted.
Key Takeaways
- Error 90004200 fires when material_type lacks a numeric percentage or uses wrong syntax (e.g., "Cotton" instead of "100 % Cotton").
- Amazon requires the exact pattern: numeric value, space, % sign, space, material name, with commas separating multiple components.
- All component percentages must sum to exactly 100 %; any total of 95 % or 105 % triggers the error.
- A pre‑upload spreadsheet macro can flag up to 200 missing‑% entries in a 5,000‑item batch, preventing bulk rejections.
Recommended Actions
- →In Seller Central, go to Reports > Feed Processing Summary, filter for error 90004200, note the SKU and material_type attribute.
- →Edit the inventory file (CSV or API payload) to use the format "XX % Material" for each component and ensure the percentages total 100 %, then re‑u...
- →Create or run a spreadsheet macro that scans the material_type column for cells without a "%" sign and corrects them before any bulk upload.
Comments
Join the discussion
Log in or create an account to share your thoughts on this update.
No comments yet. Be the first to share your thoughts!