Overview

Error 90191 is a listing feed validation error that Amazon returns when a seller attempts to set a date-type attribute to a value in the future. This error commonly appears during product listing creation or updates via flat files, feeds, or API submissions, and it prevents the listing change from being processed until the date is corrected.

Key Points / What Sellers Need to Know

• What triggers it — Amazon's system rejects any listing submission where a date-based attribute contains a date that falls after the current date. The error message specifically identifies which attribute caused the failure.
• Common culprits — Date fields such as release date, expiration date, launch date, or other product-specific date attributes are the most frequent sources of this error when accidentally set to future values.
• Feed-level rejection — This is a validation error, meaning Amazon catches it before the listing data is applied. The specific record in your feed will fail while other valid records may still process successfully.
• Attribute identification — The error message includes the name of the problematic attribute in the format: "Attribute '{attribute_name}' must not be changed to a date in the future," making it straightforward to identify which field needs correction.

How This Error Occurs

Sellers most commonly encounter Error 90191 when uploading inventory files, submitting product feeds through Seller Central, or making API calls that include date-type attributes. The error is triggered during Amazon's server-side validation step, which checks all submitted data against a set of business rules before applying changes to the catalog. A date attribute that references any point in the future — even by a single day — will cause this validation to fail for that particular record. This can happen due to simple data entry mistakes, timezone discrepancies, incorrect date formatting that Amazon interprets differently than intended, or copy-paste errors from template files that contain placeholder dates.

How to Fix Error 90191

The resolution for this error is straightforward: identify the attribute named in the error message and update its value to a date that is today or in the past. Start by reviewing your submission file or feed and locating the exact field referenced in the error. Correct the date to an accurate, non-future value and resubmit the listing data. If you are using flat file templates, double-check that date columns are formatted correctly according to Amazon's required date format (typically YYYY-MM-DD). When working with bulk uploads, it can be helpful to sort or filter your spreadsheet by date columns to catch any obviously incorrect future dates before submitting.