Master Demand Schedule names trigger the material requirements planning process. A master demand schedule name must be created to perform material requirement planning for maintenance Work Orders.

To define a MRP name:

1. Navigate to the MRP Names window.
2. Enter an alphanumeric Name to identify unique material requirements.
3. Optionally, enter a Description of the MRP name.
4. Optionally, select the Feedback check box to monitor the quantity of the planned order that has been implemented as maintenance Work Orders, purchase orders, or purchase requisitions. This provides the planner visibility of
the status of the plan at any point in time.
5. Optionally, select the Production check box to enable a plan to automatically release planned orders.
6. Optionally, enter an Inactive On date on which to disable the plan.
As of this date, you can no longer update the plan, nor use the plan name in the planning process. You can still view information and run reports for disabled names.
7. Save your work.

Check plan options @
http://www.oracleug.com/user-guide/master-schedulingmrpscp/plan-generation