Error 18004 — Listing creation conflict with existing catalog data

The product attributes you submitted conflict with the existing catalog record for this ASIN. Amazon won't let you overwrite the catalog — you'll need to either match the existing data or file a dispute.

Product detail pages are shared. When your data (title, brand, dimensions, etc.) doesn't match what's already in the catalog, Amazon flags the conflict to protect catalog integrity.

1. Compare your data against the live ASIN — copy the existing values exactly into your feed.
2. If you believe the existing data is wrong, file a Catalog Dispute via Seller Central → Help → Catalog Issues, providing evidence (manufacturer site, packaging photos).
3. For brand owners: enroll in Brand Registry — it gives you authority to update the detail page directly.
4. Resubmit your feed once your data matches the catalog.

• Submitting a slightly different title 'as an improvement' — Amazon rejects unless you're the brand owner
• Catalog disputes can take 3-7 business days; plan accordingly