Explanation
For Financials or Projects: If you enabled Rolling Forecast, click Rolling Forecast to select the basis for continuous planning. Select the planning frequency (monthly or quarterly), the number of periods (12, 18, or
24 months, or 4, 6, or 8 quarters) and the number of actual periods.
For Financials, you can also select a weekly planning frequency and choose whether to plan at a weekly level for 13, 26, or 52 weeks.
References:
https://docs.oracle.com/cloud/latest/pbcs_common/EPBCA/common_configure_planning_and_forecase_prepara