How To Fix KN129 - Selection interface for classification set as default

KN129 - Overview

• Message type: E = Error

• Message class: KN - Reporting for Costing

• Message number: 129

• Message text: Selection interface for classification set as default

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message KN129 - Selection interface for classification set as default ?

  The SAP error message KN129, which states "Selection interface for classification set as default," typically occurs in the context of material master data or customer/vendor master data when there is an issue with the classification settings in the system.
  
  Cause:
  The error usually arises due to one of the following reasons:
  
  Default Settings: The system is trying to use a classification selection interface that has not been properly set up or is not available.
  Missing Configuration: The classification system may not be configured correctly, or the necessary classification types may not be assigned to the relevant master data.
  User Authorizations: The user may not have the necessary authorizations to access the classification data or to make changes to the settings.
  
  
  Solution:
  To resolve the KN129 error, you can take the following steps:
  
  
  Check Classification Settings:
  
  Go to the transaction code CL02 (Change Class) or CL01 (Create Class) to verify if the classification types are correctly defined.
  Ensure that the classification