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

An **"Ambiguous value [gtin]"** error in Google Merchant Center means Google can't recognize the GTIN you've provided, likely because it's not in the correct format or length (8, 12, 13, or 14 digits). 

Here's a breakdown of the issue and how to fix it:

### Tables of Content

1. [Understanding common unique identifier error](#1-1-understanding-common-unique-identifier-error)
2. [What Impact of common unique identifier error](#1-2-what-impact-of-common-unique-identifier-error)
3. [How to fix commom unique identifiers error in Google Merchant Center ( Ambiguous value gtin)](#1-3-how-to-fix-commom-unique-identifiers-error-in-google-merchant-center-ambiguous-valuegtin)

# 1. Understanding common unique identifier error

* **GTIN (Global Trade Item Number):** A unique identifier for a product, often found on barcodes.

* **Why the Error Occurs:**
    
* **Incorrect Length:** GTINs must be 8, 12, 13, or 14 digits long.
    
* **Invalid Format:** The GTIN might contain non-numeric characters or use formatting that doesn't match a standard GTIN type.
    
* **Incorrect Checksum:** The GTIN might have an invalid checksum, which is a technical method used to verify data correctness.
    
* **Misidentified GTIN:** You might have accidentally entered the GTIN for a different product or variant.

# 2. What Impact of common unique identifier error

This error can lead to your products being disapproved or having limited performance in Google Shopping.

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

Make sure that you have submitted the correct value for your [gtin](https://socialhead.crisp.help/en/article/your-quick-guide-to-the-google-merchant-center-product-data-fields-o17eiw/?bust=1713357514887) attribute. 
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