Diagnosis
During the forecast run, the system read no historical time periods orinconsistent historical time periods for the material entered for theplant.

System Response
The system cannot run the forecast for the material entered for theplant, as there is either no history available or the history isinconsistent.
Possible reasons for this are:

• No supply of historical data


• The check for incomplete data in the history has revealed that for a
given period indicator, at least one period has an invalid date for thefirst day of the period. This could be caused by changing the periodindicator in the forecast master data.

Procedure
A sufficient number of valid historical periods must be available inthe system.