The account owner can protect completed books and temporarily open a small date range for an agreed correction.
1. Choose the area to lock
Open Accounting → Lock Transactions. Confirm the business, then choose Invoicing, Purchases, Accounting, or All Transactions.
2. Set the completed date
Review Locked Through and the reason before confirming. Check Lock History afterward.
3. Allow a specific correction
Use Partially Unlock when appropriate. Enter From, To, and Reason for Unlocking.
4. Relock the dates
Make the agreed correction, then choose Lock the Unlocked Dates Again. Check the history. A later payment in an open period is separate from editing an old locked sale.