Overview

Amazon Seller Central returns error 99008 when two fields in a bulk upload file contradict each other. The conflict stops the affected row from being processed, forcing sellers to pause and correct the data. Resolving the issue quickly is essential for anyone who relies on flat‑file feeds to launch or update large product assortments.

Key Points

• Conflicting values — The error appears when the entry in one column does not align with the entry in another column of the same row, such as a “Clothing” product type paired with a “Battery‑Operated” variation theme.
• Row rejection — Amazon discards the entire record once a conflict is detected; the rest of the file can still be accepted if no other issues exist.
• Strict drop‑down enforcement — Attributes that rely on Amazon‑provided pick‑lists must match the exact wording; even an extra space or a different case will trigger the error.
• Pre‑upload validation — The “Check My File” tool scans the feed for mismatches before submission, allowing sellers to catch most 99008 problems early.
• Category‑specific rules — Each product category has its own set of permissible attribute combinations, so a value valid for “Home & Kitchen” may be invalid for “Sports & Outdoors.”
• Hidden characters — Copy‑pasting from external spreadsheets can introduce non‑visible characters that break the match, even when the visible text looks correct.

How Error 99008 Happens

1. Upload initiation — You submit a flat‑file feed (e.g., inventory_template.xlsx) through the “Add Products via Upload” interface.
2. System cross‑check — Amazon’s validation engine compares related columns row by row, such as “Product Type” versus “Variation Theme.” If the pair violates a predefined rule—like assigning “Electronic” to a product type that only supports “Size” variations—the engine flags the row.
3. Error generation — The platform returns error 99008, listing the two columns that conflict and marking the specific row as rejected. For example, a row with “Product Type = Shoes” and “Size Map = Battery” would be rejected because “Battery” is not an allowed size attribute for shoes.