You must not add key figure &

What causes this issue?

Data already exists for this planning area. Therefore you are not
allowed to add time series key figures.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

How to fix this error?

To add a key figure, you must first delete all time series objects for
the planning area. To do so, go to S&DP Administraion (choose
<ZK>Demand Planning -> Envronment -> Current Settings -> Administration
of Demand Planning and Supply Network Planning). </> Select the
relevant planning area and from the context menu choose <ZK>Delete Time
Series Objects</>.
You must delete the time series objects in all active planning
versions.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.