SAP Message /MAP/M819 - Forecast model &1: char. &2 of infl. factor &3 is not in forecast level

Diagnosis
Influencing factor &V3& is assigned to forecast model &V1&.Characteristic &V2& is contained in the definition level but not in theforecast level.
This is not permitted. The quantity of the characteristic in theforecast level must be a superset of the characteristics of all assignedinfluencing factors.

System Response
Processing is cancelled.

Procedure
Include characteristic &V2& in the forecast level.