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# Brand:gtin:identifier_exists:mpn universal ids are missing

When managing product listings, it's crucial to ensure that your products have the correct universal identifiers. One common issue is the error message: **`Brand:gtin:identifier_exists:mpn universal IDs are missing`**. This means that your products are missing all three essential attributes:

* **Brand** (Vendor)
* **GTIN** (Global Trade Item Number)
* **MPN** (Manufacturer Part Number)

Without these identifiers, your products may not be properly recognized in search engines or shopping feeds. In this guide, we’ll walk you through the steps to resolve this issue efficiently.

### Table of Contents

1. [Understanding the Issue](#1-understanding-the-issue)
2. [Why These Identifiers Matter](#1-why-these-identifiers-matter)
3. [How to Fix the Issue](#1-how-to-fix-the-issue)
---

# Understanding the Issue

If your products are missing the **Brand, GTIN, and MPN**, they may not be properly indexed in search engines or e-commerce platforms. This can result in lower visibility, incorrect product categorization, and even rejection from some marketplaces.

To fix this, you only need to provide **at least the Brand (Vendor)** information.

# Why These Identifiers Matter

1. **Brand** – Helps categorize and authenticate the product for better search visibility.
2. **GTIN** – A universal product identifier used by retailers and marketplaces to track inventory.
3. **MPN** – A unique number assigned by the manufacturer to distinguish products.

Adding at least the **Brand** helps resolve this issue quickly.

# How to Fix the Issue

### 1. Updating Brand Information on Your Website

The simplest way to fix this issue is by adding the **Brand (Vendor)** details to your products. Here’s how:

1. Go to your **product management system** or **CMS**.
2. Locate the **Brand** field for each product.
3. Enter the correct brand name.
4. Save and update the product listing.

This ensures that each product has a valid brand, preventing errors in your listings.

### 2. Adding Brand in Bulk via File Mapping

If you have multiple products missing a brand, you can update them in bulk using the **File Mapping** feature in your app. Follow these steps:

1. Navigate to **File Mapping** in your app.
2. Locate the **Brand** field.
3. Click on **Add Rule** to automate brand addition.

![](https://storage.crisp.chat/users/helpdesk/website/-/c/b/9/2/cb92164b6e8ef000/image_g4yr75.png)

4. Configure the rule as follows:
* **Set Value to:** Enter the brand name you want to apply.
* **Where:** Some Products.
* **If Vendor is empty.**

![](https://storage.crisp.chat/users/helpdesk/website/-/c/b/9/2/cb92164b6e8ef000/image_o56o1o.png)

5. Save and apply the rule.

By using this method, all products with an empty vendor field will automatically be assigned the brand you specify.
---

Fixing the **Brand:gtin:identifier_exists:mpn universal IDs are missing** issue is essential for maintaining accurate product listings. By simply adding the **Brand (Vendor)** information, you can resolve this problem quickly. For bulk updates, use the **File Mapping** feature to automate the process efficiently.

By following these steps, your products will be properly indexed, ensuring better visibility and smoother operations across online marketplaces.

If you have any further assistance, don't hesitate to contact us via in-app live chat or email at [support@socialhead.io](mailto:support@socialhead.io)