How to Fix Duplicate SKUs on eBay Items

If your eBay account contains items with duplicate SKUs, SellerActive will not import your full inventory. Here's how to use SellerActive and eBay to correct SKU errors and ensure a full import.

On every marketplace you have the ability to assign a SKU to differentiate your products, and while eBay doesn't use SKUs to differentiate between items, sellers can enter SKU details into a field called "Custom Label". SellerActive uses SKUs to identify and skip duplicates during the import process.

If your eBay account contains items with duplicate SKUs/Custom Labels, we will not import your full inventory. This includes both individual listings and variations.

The only way to make Custom Label edits or remove listings entirely is through your eBay Seller Dashboard. Once edits have been made on the marketplace, you will be able to import your full inventory into SellerActive.

  1. How to Identify Duplicate SKUs Using SellerActive
  2. How to Fix Duplicate SKUs on ebay

How to Identify Duplicate SKUs Using SellerActive

Once SellerActive has received your inventory file from eBay, you will be notified on your account dashboard if duplicate SKUs are located. Follow the link in your notifications panel, and you will be prompted to download a file that contains duplicate SKU information.


This text file is very large because it is the full inventory file from the marketplace. To isolate your duplicate data, open this file in Excel, and sort your data by SKU and ebay_item_id.

Tip: In Excel, if you select and highlight the SKU column, and use the Conditional Formatting option to find Duplicate Values, Excel will highlight the duplicate SKUs in red for you. You may then "Sort by Color" or "Filter by Color" in Excel to view the duplicate SKUs. 

Image from Gyazo
Image from Gyazo

Here is an example of a file that has already been edited to isolate the duplicates, and the eBay Item ID column is highlighted.



How to Fix Duplicate SKUs on eBay

To fix these duplicates, log into your eBay seller account and update the Custom Label field.

The fastest way to update the Custom Label for your products in eBay is in bulk through the File Exchange tool. This can be found under Home -> My eBay  -> File Exchange.

In File Exchange navigate to Download Files -> Listings and Records -> Select (Active) -> Download Format (Standard) -> Date Range (All Active Listings) -> Save

Image from Gyazo

Correct the duplicate SKU's that were highlighted in the SellerActive duplicate download and upload the File Exchange CSV file back to eBay. Most sellers will append their SKU with a dash and number to differentiate it or delete the SKU entirely. 

When done, navigate back to SellerActive, and click Settings > Integrations > eBay. Select "Import" to repeat the process.


How do duplicates happen on eBay?

eBay utilizes the eBay Item ID as a way to relist your products without having to re-construct the listing. When an item it set to re-list, a new item ID is created, and the previous listing is moved to Inactive. There are settings that will prevent this situation from happening moving forward and these can be established within eBay and SellerActive.

In a situation like this we will see an item be marked as inactive a long time ago and then the same item is re-listed later down the line with the same Custom Label. There are circumstances where two entirely different items are listed with the same Custom Label and one of them will just need to be deleted.