How to Fix Error 8018: Deleting a Non-Existing Product Relationship
Error 8018 appears when a bulk Relationships feed tries to delete a parent‑child link that Amazon cannot locate. The feed returns “Cannot delete a non‑existing relationship for SKU [XYZ]”. Using the Relationships report (Inventory → Relationships) and a weekly export prevents most occurrences.
Overview
Sellers using Amazon’s bulk relationship feeds may encounter error 8018 when they try to delete a parent‑child link that does not exist in the catalog. The message appears during feed processing and can halt a batch of updates. Recognizing why the error occurs and how to address it prevents unnecessary resubmissions and keeps catalog‑management workflows running smoothly.
Key Points
- Error text — The feed returns “Cannot delete a non‑existing relationship for SKU [XYZ]”, where [XYZ] is the parent SKU you attempted to modify.
- Root cause — The delete instruction references a parent‑child pairing that Amazon cannot locate in its current product‑relationship database.
- Typical trigger — Bulk feeds that contain outdated SKU pairings, such as a child SKU that was already removed in a prior submission, generate the error most often.
- No fix required in many cases — If the relationship never existed, the error is informational only; the catalog already reflects the desired state.
- Impact on processing time — Although not a health‑risk, the error adds entries to the feed‑processing log, which can clutter reports for sellers handling large inventories.
- Prevention tip — Maintaining a fresh export of active relationships before issuing delete commands eliminates most occurrences.
How Product Relationship Feeds Work
- Create or modify a feed file — Sellers compile a tab‑delimited or XML file that lists parent SKUs, child SKUs, and an action code (e.g., “delete”). For example, a row might read
PARENT123\tCHILD456\tD. - Upload to Seller Central — The file is submitted through the “Relationships” feed type in the bulk upload interface or via the Marketplace Web Service (MWS) API.
- Amazon parses each line — The system searches its internal relationship table for a match between the supplied parent and child SKUs.
- Action execution — If a matching link exists, Amazon removes it and records a successful status. If no match is found, the system returns error 8018 for that line, leaving the rest of the feed untouched.
Analysis & Recommendations
Why This Matters
Although error 8018 does not affect listing visibility or account health, it adds noise to feed‑processing logs and can delay large‑scale deletions. Sellers with thousands of SKUs may see multiple 8018 entries per feed, slowing cleanup cycles and requiring extra manual verification.
Key Takeaways
- Error 8018 is triggered when a delete line references a parent‑child pair absent from Amazon's relationship database.
- The Relationships report (Report Type = Inventory → Relationships) lists every active parent‑child pair and is the source of truth for deletions.
- If the relationship never existed, the error is informational only and no further action is needed.
- Scheduling a weekly export of the Relationships report eliminates most 8018 errors.
Recommended Actions
- →Download the latest Relationships report via Seller Central > Reports > Inventory > Relationships before creating delete feeds.
- →Run a pre‑flight script to compare each parent‑child row in the delete file against the report and remove any non‑matching rows.
- →Resubmit the corrected feed through Seller Central > Bulk Upload > Relationships or via the MWS API.
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