Some transactions appear twice in my VAT return. How can I delete one of them?

I'm here to assist you in deleting duplicate transactions, stef-bojara. 

It's possible that we created another VAT rate and selected it instead of the existing one. We can inactivate the created VAT rate first since we can't totally delete it. Then, toggle those duplicate transactions to the correct one. If these transactions are mistakenly added we can delete them. 

Here's how to inactivate a VAT rate:

1. Go to the Sales menu and select VAT. 
2. At the upper-right, click the Edit VAT drop-down. 
3. Select Edit rates.
4. Toggle the created tax rate to inactivate it. 
5. Click Yes to confirm the changes. 

Inactivated VAT rates will not show when creating transactions. Now we can modify your transactions by opening them. If you want to delete it, we can click More at the bottom and select Delete. Hit Yes to confirm. 

I also added an article for more information about VAT. 

I'll be here if you need anything else. Thanks!