Message type: E = Error
Message class:  MAFWKF - Analyzer Framework: Messages for Key Figures 
Message number: 301
Message text: Basic key figure &1 of key figure &2 must be defined in eval.proc.1
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The SAP error message MAFWKF301 indicates that there is a problem with the configuration of key figures in a planning application, specifically in the context of the evaluation process. This error typically arises when a basic key figure is not defined in the evaluation process for a composite key figure.
Cause: Missing Definition: The basic key figure (indicated as &1 in the error message) is not defined in the evaluation process for the composite key figure (indicated as &2).
Configuration Issues: There may be issues in the configuration of the planning model or the evaluation process that prevent the system from recognizing the relationship between the key figures. Data Model Changes: Changes in the data model or key figure definitions that have not been properly updated in the evaluation process.
Solution: Check Evaluation Process: Go to the evaluation process configuration in the SAP system and ensure that the basic key figure is defined correctly. You can
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