I see how important it is to maintain your accounts accurate in your QuickBooks Online (QBO) account. Altering a transaction can lead to discrepancies within your books. However, the option to lock a transaction in QBO is currently not available.
As a way around, you can change the user type of your QBO users. That way, they can’t view or alter your transaction. Let me show you how:
Navigate to the Gear icon.
Select Manage Users.
Locate the user you want to edit and click the Edit link under the ACTION column.
Then select a user type from the User type drop-down menu.