There are two things you can lock: Transactions and Accounting information.
General difference:
Transaction locking
Transaction locking doesn’t allow you change anything (name, dates, amounts, revenue recognition, etc)
The lock date looks at the start date of the transaction
Accounting locking
1) You are able to change items in the transaction
The only thing that is locked is the Accounting information, such as recognized revenue, invoiced amounts. The accounting Revenue will remain the same even if something about the transaction is changed.
The lock date will lock anything in Accounting Revenue before that date
Accounting locking - more details:
These are additional (more granular) cases where the accounting spread will be locked:
You can lock both options in the Transactions page, in the corresponding toggles in the top of the page:
