General Ledger - Periodic Processing

From the help.sap.com  Periodic Processing documentation the following is stated Periodic Processing 

Purpose

Periodic processing functions are functions that you perform at regular intervals. You perform the following functions periodically in General Ledger Accounting:

-         Planning

You can use the planning function in General Ledger Accounting to enter and distribute plan data to create budgets, forecasts, and other reports.

-         Closing Operations

In this section, you find processes and functions that you perform at the end of the fiscal year to create your financial statements.

-         Balance Interest Calculation

You can use the balance interest calculation function to calculate interest on the balance of G/L accounts managed on an open item basis. You use this function, for example, to check the interest calculated on your accounts by the bank.