> ## Documentation Index
> Fetch the complete documentation index at: https://help.vori.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to troubleshoot ESL linking issues with Type-2 UPCs

> This article explains common issues with Type-2 UPC formatting that can lead to ESL linking issue, and how to fix them

### **Introduction**

The Vusion Link app requires Type 2 UPCs to follow a very specific 12‑digit format. If an ESL shows “Not on file,” the product’s UPC in Back Office likely doesn’t meet that format. This article shows you how to spot mis‑formatted Type 2 UPCs and correct them—either on the store handheld or in Back Office.

**Not-on-file ESL example**

*If linking a code to an ESL shows a blank screen with a **`?`** icon, the code isn’t in the store’s product file—or it’s a Type-2 UPC in a format the Vusion Link app doesn’t recognize.*

***

### **Recognizing a Type-2 UPC formatting error**

The Vusion Link app only recognizes Type-2 UPC's in the following format:

✏️ **Note -** Each of the 4 distinct sections of a Type-2 UPC have strict length requirements.
​
​\_For example, Type-2 PLU codes are always 5 digits.\_

If the **on-file** product code does not match this formatting, the ESL will not recognize the product code.

#### Commonly rejected Type-2 UPC Formats

| **Problem**                | **Example of bad code** | **What to enter instead**                                                           |
| -------------------------- | ----------------------- | ----------------------------------------------------------------------------------- |
| **PLU only (5 digits)**    | `00054`                 | Enter the full 12‑digit Type 2 UPC, e.g. `200054000005`                             |
| **Short PLU (1–4 digits)** | `54` → assumed `00054`  | Pad the PLU to 5 digits with leading zeros, then build the full UPC: `200054000005` |
| **Wrong check digit**      | `200054000009`          | Let Vori auto‑generate the last digit.                                              |

***

### Correcting a Type-2 UPC's format in Back Office

1. Open [app.vori.com](https://app.vori.com) and log in.

2. On the lefthand menu, select the **`Products`** tab then **[`Product Catalog`](https://app.vori.com/retail/products)** from the dropdown menu.

3. Search for the product by entering its product code in the search field on the top right corner of the screen.

4. Open the product's detail page by clicking the arrow to the far right of the product's row.

5. Select the **`Product Details`** tab on product's page.

6. In the **Barcode** field, re-enter the product's UPC in the correct format.

   1. For check digit, enter the number prompted on-screen.

7. Hit **`Save`** at the bottom of the product's page.

***

### Correcting a Type-2 UPC's format in Back Office

1. Log into the VoriOS app on the store handheld.

2. Tap into the `**Search Products**` field at the bottom of the main screen.

3. Type in the product's code, then select it from the search results below.

4. Select **`Edit Product Details`** at the bottom of the screen.

5. Select the **`Details`** tab within the product's page.

6. Tap into the **Barcode** field to begin editing the barcode.

7. Re-enter the barcode in the correct Type-2 formatting, then hit **`Save`**.

   1. For check digit, enter the number prompted on-screen.

8. Tap **`Save`** on the product's page to commit the barcode update.


## Related topics

- [How to search, view, & troubleshoot ESLs using Vusion Manager](/electronic-shelf-labels-esls/how-to-search-view-and-troubleshoot-esls-using-vusion-manager.md)
- [Set Up Variable Weight Barcodes](/product-and-product-catalog-management/product-creation-and-set-up/set-up-variable-weight-barcodes.md)
- [Manage Type 2 UPCs for Items Over $100](/product-and-product-catalog-management/product-creation-and-set-up/manage-type-2-upcs-for-items-over-100.md)