Overview

On certain occasions Amazon Seller Central returns error 100605, stopping any attempt to change a product’s cost. The message indicates that the cost‑update request was rejected, which can interrupt pricing automation and cost‑tracking routines. Sellers must understand the triggers and corrective actions to keep their cost data accurate and their workflows uninterrupted.

Key Points

• Multiple rejection triggers — The error can stem from formatting mistakes, overlapping updates, or exceeding marketplace‑specific cost‑change limits, so pinpointing the exact cause is essential before fixing.
• Currency and numeric format matter — Using an incorrect currency code, inserting special characters, or applying the wrong decimal precision (e.g., “12,34” instead of “12.34”) will instantly generate error 100605.
• Concurrent updates cause conflicts — If a price or cost modification is already being processed for the same SKU, any additional request for that SKU is blocked until the first operation finishes.
• Marketplace thresholds are enforced — Each Amazon locale caps how much a cost can rise or fall in a single update; surpassing that cap (for example, a 30 % jump in a European marketplace that allows only 20 % per change) leads to rejection.
• Bulk uploads amplify the risk — Large feed files that contain many cost changes increase the chance of hitting formatting or threshold rules, especially when the same SKU appears multiple times.

How to Resolve Error 100605

1. Validate currency code — Confirm that the three‑letter code matches the target marketplace (e.g., EUR for Amazon.de, GBP for Amazon.co.uk). If a US‑based feed tries to send “USD” to a German listing, replace it with “EUR”.
2. Check numeric formatting — Ensure the cost uses a period as the decimal separator, includes no commas or currency symbols, and respects the marketplace’s allowed precision (usually two decimal places). For instance, change “1 299,99” to “1299.99”.
3. Cross‑verify the cost value — Compare the new cost against the current cost to see whether the percentage change stays within the marketplace’s limit. If the current cost is $10 and the new cost is $15, verify that a 50 % increase is permitted; otherwise, lower the proposed amount to stay under the threshold.