Lock past months/quarters/years so no new transactions or edits can post to them. Required after you file taxes or sign off audited statements — otherwise a back-dated edit silently changes filed numbers.
Settings → Accounting Periods.
Months listed for the current fiscal year. Status: Open, Locked, or Closed.
After your accountant finishes month-end review and files VAT, lock the month. Locked periods reject new transactions + edits.
Only super-admin can unlock. Every unlock is audit-logged + emailed to the company owner.