A transaction locks automatically when the VAT period or financial year is locked. However, you can unlock an individual transaction if needed, for example if there's an error in the posting that needs to be corrected. If you've locked the financial year, remember to unlock the financial year first from the Financial Years tab.

Open the transaction from the Transactions tab, click the three-dot menu in the top right corner, and select "Unlock". After that, you can edit the transaction normally.

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