Overview

Sellers may see error 90145 when they try to edit a product attribute on an existing Amazon listing. The message states that the value for a specific field cannot be changed, indicating that Amazon has locked that attribute. Understanding why the lock occurs and how to work around it is essential for maintaining accurate listings and avoiding delays.

Key Points

• Locked attributes — Once a listing is live or Amazon has verified certain data, fields such as brand, product type, or item‑type keyword become immutable, preventing edits through normal channels.
• Specific field identified — The error displays the exact attribute name inside the placeholder, for example “Value for ‘brand_name’ must not be changed,” helping sellers pinpoint the problem.
• All bulk methods affected — The restriction appears in inventory file uploads, SP‑API calls, and other bulk update tools, not only in the Seller Central UI.
• Resolution possible via support — Although the attribute cannot be altered directly, sellers can request a change through Amazon Seller Support or a product detail page correction.
• Prevention relies on initial accuracy — Double‑checking critical fields before the first upload dramatically reduces the likelihood of encountering the lock later.
• Impact on workflow — The error adds extra handling time, especially for sellers using automated inventory systems that include locked columns in their feeds.

How to Resolve Error 90145

1. Open a support case — Log into Seller Central, navigate to the “Contact Us” page, and select “Listing Issues” → “Edit Product Details.” Include the exact error code (90145) and the attribute name that Amazon flagged.

   • Example: A seller sees “Value for ‘brand_name’ must not be changed.” The case description reads: “Error 90145 – need to update brand_name from ‘Acme’ to ‘Acme Co.’”

2. Provide verification documents — Attach any relevant proof that supports the requested change, such as a brand authorization letter, manufacturer’s spec sheet, or trademark registration.