Error 5118 — Duplicate AttributeSetId

You specified the same Item Specifics twice. Your item could not be listed. Please contact your tool provider to resolve this issue.

eBay Item Specifics (key-value attribute pairs) are increasingly required and enforced for catalog matching. Each category has its own set of required and recommended specifics, and missing/invalid values block or limit the listing.

1. Look up required and recommended item specifics for your category using the GetCategorySpecifics API.
2. Fill in EVERY required specific (marked REQUIRED in the API response) — those are blocking.
3. For recommended specifics, fill in as many as accurate — they boost search ranking and category eligibility.
4. Use eBay's suggested values where provided — free-text values that don't match the suggested set may be flagged as spam.

• Submitting custom item specifics in categories that no longer accept them — eBay restricts to controlled vocabularies
• Different specifics required per site (US vs UK vs AU) — refresh per marketplace