1. In Accounting Module, please click at "Configuration" 

2. Click at "Accounting Periods".

3. Click at "Close Period"

4. You will be asked to confirm next accounting period. After you have confirm, click "Submit".

5. That year will be close for preview. Only adjustment for existing transaction is allowed to enter. No additional transaction is made during Close For Preview.

6. You can "Finalize" to close the prevous Accounting Period.