How To Fix WN108 - There are inconsistencies in class system

SAP Error Message - Details

• Message type: E = Error

• Message class: WN - Plant master data maintenance (integrated)

• Message number: 108

• Message text: There are inconsistencies in class system

What causes this issue?

At first please remove the inconsistencies in your defined classes and
merchandise categories.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WN108 - There are inconsistencies in class system ?

  The SAP error message WN108, which states "There are inconsistencies in class system," typically indicates that there are discrepancies or inconsistencies in the classification system within the SAP system. This can occur in various scenarios, such as when there are issues with the classification data, the class hierarchy, or the characteristics assigned to classes.
  Causes:
  
  Data Inconsistencies: There may be inconsistencies in the classification data, such as missing or incorrect characteristics or values.
  Class Hierarchy Issues: Problems with the class hierarchy, such as circular references or missing parent classes.
  Transport Issues: If changes were transported from one system to another (e.g., from development to production), inconsistencies may arise if the transport was not executed correctly.
  Database Issues: Corruption or issues in the underlying database tables that store classification data.
  Custom Development: Custom programs or enhancements that manipulate classification data may introduce inconsistencies.
  
  Solutions:
  
  Check Class and Characteristic Data: Review the classes and their assigned characteristics to ensure that all necessary data is present and correct.
  Use Transaction CL02: You can use transaction CL02 (Change Class) to check the class hierarchy and characteristics. Look for any inconsistencies or missing links.
  Consistency Check: Use transaction CL30 (Class Management) to perform a consistency check on the classification system. This can help identify specific inconsistencies.
  Recreate Classes: If a class is found to be corrupted, you may need to recreate it and reassign the characteristics.
  Transport Management: If the issue arose after a transport, check the transport logs and ensure that all necessary objects were included in the transport.
  Database Consistency: If you suspect database issues, you may need to run database consistency checks or consult with your database administrator.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide patches.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for classification and class management for detailed guidance on managing classes and characteristics.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to identify and resolve the inconsistencies causing the WN108 error in your SAP system.