Accidentally entered the same invoice twice as an expense.

We have answered your question in a video: https://youtu.be/xs8cdGhzgK4

Thank you very much for this clear answer!

If you accidentally entered the same purchase invoice twice in your accounts and have already submitted your vAT declaration, this is easy to fix. Download the original document again and enter it as an internal credit note in the next open quarter.

When entering the transaction, make sure you select 'credit note' so that the amount is entered as negative.

In the event of a tax audit, you can demonstrate that you corrected the error yourself as soon as you discovered it. This is sufficient to avoid penalties.