How To Fix CM_MDG_BS_CLF_GEN020 - Class type &1 excluded; class type already changed without change number

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_MDG_BS_CLF_GEN - Classification Message Class

• Message number: 020

• Message text: Class type &1 excluded; class type already changed without change number

What causes this issue?

You entered a change number, but class assignment or valuation for this
class type has already been changed without a change number.

System Response

The class type is excluded from display and maintenance.

How to fix this error?

To display or maintain this class type leave the transaction and open
classification again without entering a change number.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CM_MDG_BS_CLF_GEN020 - Class type &1 excluded; class type already changed without change number ?

  The SAP error message CM_MDG_BS_CLF_GEN020 indicates that a class type is excluded because it has already been changed without a change number. This typically occurs in the context of Master Data Governance (MDG) when trying to manage or modify class types in the system.
  Cause:
  
  Class Type Already Changed: The error arises when a class type has been modified directly in the system without using a change number. In SAP, change numbers are used to track changes and ensure that modifications are managed properly.
  Inconsistent Data: The system may have detected that the class type is in an inconsistent state due to direct changes, which can lead to issues in data integrity and governance.
  Configuration Issues: There may be configuration settings in the MDG that prevent changes to certain class types if they have been altered without proper change management.
  
  Solution:
  
  Use Change Numbers: Ensure that any changes to class types are made using a change number. This is a best practice in SAP to maintain data integrity and track changes.
  Check Change Logs: Review the change logs for the class type to identify any unauthorized or direct changes that may have been made. This can help in understanding the state of the class type.
  Revert Changes: If possible, revert the changes made to the class type that caused the error. This may involve restoring the class type to a previous state where it was not excluded.
  Consult Documentation: Refer to SAP documentation or notes related to the specific error message for additional guidance and troubleshooting steps.
  Contact SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP support for assistance. They may provide insights specific to your system configuration and version.
  
  Related Information:
  
  Change Management in SAP: Understanding how change management works in SAP, especially in the context of MDG, is crucial. Familiarize yourself with the concepts of change numbers, change requests, and how they are used to manage master data.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches and updates that could resolve the issue.
  Training and Best Practices: Consider training for users involved in master data management to ensure they understand the importance of using change numbers and following proper procedures when making changes.
  
  By following these steps, you should be able to address the error and prevent it from occurring in the future.