SAP Message REMPT313 - Scheduling levels not maintained in Customizing

Diagnosis
Problems occurred when scheduling the planned order.
This may be as a result of the following:
You have not maintained Customizing for the scheduling level you usedto access the planning table.

Procedure
You define the scheduling level for the various types of planned ordersin Customizing:
Proceed with function
The routings in the production version in the material master record(MRP 4 screen) must be entered according to the scheduling levelsettings in Customizing (Determining scheduling and capacity reqmts viadetailed or rate-based planning).
Proceed with function
If you have made any changes, you have to restart the planning table toactivate these changes.