# What happens if the source code sets includes redundant codes?

The system checks for duplicate source code pairs and an import error occurs if two rows in the source code set contain the same code. An example of this is shown in the image below.

<div data-full-width="true"><figure><img src="https://confluence.ihtsdotools.org/download/thumbnails/149259275/Screenshot%202022-05-23%20at%2009.01.43.png?version=1&#x26;modificationDate=1654236640000&#x26;api=v2" alt=""><figcaption></figcaption></figure></div>

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