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Creating, Changing and Displaying Locks 
In the contract account master record, there is one process lock field for dunning, posting, invoicing, correspondence dunning, interest calculation, incoming payments, and outgoing payments respectively. You enter a lock reason in this field if you want to lock an account. You can set the lock for a limited period or set multiple locks for each business transaction.
Prerequisites
You have maintained the lock reasons for dunning and payment in Customizing for Contract Accounts Receivable and Payable.
Procedure
A dialog box appears where you can display or enter the lock interval or the lock itself. You can also display the lock history from this dialog box. Changes related to the locks are written in the lock history and are not logged with change documents.
You can change and delete locks in this dialog box.
Note the following:
Result
The contract account is locked for the business transaction selected either for a limited or unlimited amount of time, depending on the lock reason.
