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# How to fix common unique identifiers error in Google Merchant Center (Missing value [gtin])

The Limited performance due to missing value GTIN error typically occurs when a product listing on a platform like Google is missing GTIN ( **Global Trade Item Number**). It's a warning that tells you that your product is missing this identifier and you may experience lower visibility of your products.

### Table of Contents

[How to Fix Missing Product GTIN Values](#1-how-to-fix-missing-product-gtin-values)
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# How to Fix Missing Product GTIN Values

To resolve the issue of missing GTIN values for products, please follow the steps below to ensure compliance with the requirements.

* The values submitted for the [GTIN](https://support.google.com/merchants/answer/6324461) attribute must be those allocated by the manufacturer. You must also submit a value of **true** for the [identifier_exists](https://support.google.com/merchants/answer/6324478) attribute. 

[Learn how to find a GTIN ](https://support.google.com/merchants/answer/6219078?sjid=4995727332277422469-)

* You have submitted products in a category that Google suspects to have gtins, but there is no gtins provided. Therefore, you must provide gtins for all the affected products.
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