Diagnosis
You entered no or an incorrect time period.

System Response
The program has determined and set the time period or corrected theincorrect entry.

Procedure
If you want to enter a different time period to change the wrong one,you cannot do this here (on the initial screen).
To change the time period you have to call up hierarchy maintenance inchange mode and enter the 'old' time period on the initial screen orselect it via the F4 help.
You see the hierarchy for this time period on the following screen andhere, using the function 'Change interval', you can change the timeperiod of this hierarchy.