Understanding Amazon Feed Error 99017: Resolving Conflicting Column Values
Error 99017 appears when a bulk feed contains contradictory values for the same attribute, e.g., row 237 with size 9 vs shoe_size 10. The issue often surfaces after Amazon adds new columns in a 2024 template, causing duplicate mappings and hundreds of rows to be rejected.
Overview
Amazon reports error 99017 when a bulk upload contains contradictory values for the same product attribute in a single row. The conflict appears during feed validation, blocking the affected listings from being created or updated. Sellers must resolve the mismatch quickly to keep inventory visible and avoid sales interruptions.
Key Points
- Error text — The message reads “Values assigned to [attribute] conflict with each other,” inserting the specific attribute that triggered the issue.
- Root cause — Two or more columns in the submitted file try to set different values for the identical attribute, leaving Amazon’s system unable to decide which one to keep.
- Typical sources — Using both a generic column (e.g., Size) and a specialized column (e.g., Shirt_Size) with different entries, or filling out redundant variation‑theme fields that disagree.
- Template pitfalls — Updated category templates often add new columns that overlap with older ones, causing hidden conflicts when sellers reuse previous files.
- Resolution path — Identify the rows flagged, locate every column that maps to the disputed attribute, keep the correct value, and clear the others before resubmitting.
How Error 99017 Occurs
- Feed upload — You submit a flat‑file or API feed through Seller Central; Amazon’s catalog engine scans every row for internal consistency.
- Attribute mapping check — The system matches each column header to a catalog attribute; if multiple headers resolve to the same attribute, it compares the supplied values.
- Conflict detection — When the values differ, the engine flags the row with error 99017 and returns a message that includes the attribute name.
Concrete examples for each step
- Feed upload — A seller uploads a CSV containing 5,000 shoes using the “Clothing & Shoes” template.
- Attribute mapping check — The file includes both “size” and “shoe_size” columns; Amazon maps both to the internal “Size” attribute.
Analysis & Recommendations
Why This Matters
Rows flagged with 99017 are omitted from the catalog, delaying product launches and causing missed sales. Large sellers can see hundreds of rejections, consuming hours of manual cleanup and slowing inventory updates.
Key Takeaways
- Error 99017 is triggered when two columns (e.g., size and shoe_size) map to the same internal attribute with different values.
- Amazon's 2024 category template added a shoe_size column that overlaps with the existing size column.
- A concrete conflict example: row 237 listed size 9 and shoe_size 10, causing the feed to be rejected.
- Hundreds of rows can be rejected in a single upload if the duplicate columns are not reconciled.
Recommended Actions
- →Download the error report in Seller Central > Inventory > Add Products via Upload > View Processing Report and note each row and attribute flagged.
- →Open the original flat file, locate every column that maps to the flagged attribute (e.g., size, shoe_size, variation_theme), keep the correct valu...
- →Replace the file with the latest category template from Seller Central > Inventory > Add Products via Upload > Download Template, then run a test u...
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