Overview

Sellers encounter Error 18837 when a bundle listing contains mismatched or duplicate offer listing types, preventing the product from becoming active on Amazon. The issue surfaces during flat‑file uploads, API feeds, or manual edits in Seller Central, and it stops sales until the listing is corrected. Resolving the conflict quickly restores visibility and protects revenue from bundle‑focused inventory.

Key Points

• Single offer type required — A bundle must carry only one offer_listing_type; having both “purchasable” and “bundle” values triggers the error.
• Use “purchasable_bundle” — The field must be set explicitly to “purchasable_bundle” for every bundle ASIN, otherwise Amazon rejects the feed.
• Component listings must align — Each SKU that makes up the bundle cannot retain its own independent offer type that clashes with the bundle designation.
• Resubmit after correction — After fixing the fields, the seller must resend the feed or save the changes in Seller Central for Amazon to re‑validate.
• Flat‑file precision matters — Errors often arise from copy‑pasting rows; a stray “new” value in the offer_listing_type column will cause the same block.

How to Fix Error 18837

1. Audit the bundle record — Open the feed or the product edit page and locate the offer_listing_type column for the affected ASIN (e.g., B0ABC12345). Verify whether more than one value appears, such as “purchasable” and “bundle” side by side.
2. Strip extra types — Delete any duplicate or unrelated entries so that only a single value remains. For the example above, remove “purchasable” and keep only “purchasable_bundle”.
3. Set the correct type — If the field is blank or contains an incorrect label, enter “purchasable_bundle” exactly as spelled. This tells Amazon that the SKU is a sellable bundle rather than a single item.
4. Validate component SKUs — Review each child product listed under the bundle (e.g., the charger, cable, and adapter). Ensure none of those child SKUs have their own offer_listing_type set to “purchasable_bundle” or any other type that would conflict with the parent bundle. If they do, change the child’s field to “none” or remove the column entry entirely.