Overview

Error 90237 is a catalog validation error that Amazon returns when a seller attempts to modify a product listing attribute to a value that Amazon has explicitly prohibited. This error acts as a safeguard within Amazon's catalog system, preventing sellers from changing certain product details to values that violate Amazon's data quality standards or listing policies. Understanding this error is essential for sellers who manage listings through feeds, flat files, or API integrations.

Key Points / What Sellers Need to Know

• Attribute-Level Restriction — This error targets specific product attributes (such as brand, item type, or product category) where Amazon maintains a blocklist of prohibited values that cannot be applied.
• Directional Block — The error only triggers when changing from a previously accepted value to a blocklisted one. Setting a blocklisted value on a brand-new listing may produce a different error or behave differently.
• Feed and API Impact — Sellers using inventory file uploads, flat file submissions, or SP-API product feeds are most likely to encounter this error during bulk listing updates.
• No Override Available — Once Amazon has blocklisted a value for a given attribute, sellers cannot force the change through repeated submissions. The blocklist is enforced at the catalog level.
• Error Message Format — The error appears as: "Attribute '{attribute_name}' must not be changed from any of the values in '{previous_values}' to any of the blocklisted values in '{blocklisted_values}'." The placeholders are replaced with the specific attribute, its current value, and the prohibited target value.

How This Error Occurs

Error 90237 is triggered during Amazon's catalog validation process when a product feed or listing update attempts to alter an attribute's value in a way that conflicts with Amazon's internal blocklist. For example, a seller might try to change a product's brand name, item type keyword, or another controlled attribute to a value that Amazon has flagged as inaccurate, misleading, or otherwise non-compliant. Amazon maintains these blocklists to preserve catalog data integrity and prevent issues like incorrect product classification, misleading brand associations, or category manipulation. The error is returned in the feed processing report, identifying the exact attribute, the current accepted value, and the blocklisted value that was rejected.