Synthetic example written by Agents Finance (fictional company).

The Figma subscription of March 2026 was booked with deductible 20 % VAT. Figma is a US supplier, so it should be reverse charge.
March 2026 is already filed (VAT return submitted), so changing it means running the fix with --allow-filed-periods.
Plan: 1) switch the March Figma line to reverse charge; 2) add a note for the accountant.
