How To Fix MR017 - Class & unknown

SAP Error Message - Details

• Message type: E = Error

• Message class: MR - Stock overview for generic materials

• Message number: 017

• Message text: Class & unknown

What causes this issue?

You are using a material group or a generic material for which no data
exists in the classification system. There must be a serious database
inconsistency.

System Response

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

Notify your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message MR017 - Class & unknown ?

  The SAP error message MR017, which states "Class & unknown," typically occurs in the context of the Materials Management (MM) module, particularly when dealing with invoice verification or material documents. This error indicates that the system is unable to recognize or find a specific class that is required for processing.
  Causes:
  
  Missing Class Definition: The class that is referenced in the transaction is not defined in the system.
  Incorrect Configuration: There may be an issue with the configuration settings related to classification or material master data.
  Authorization Issues: The user may not have the necessary authorizations to access the class or related data.
  Data Inconsistencies: There could be inconsistencies in the data that are causing the system to fail to recognize the class.
  
  Solutions:
  
  
  Check Class Definition:
  
  Go to the transaction code CL02 (Change Class) or CL03 (Display Class) to verify if the class exists.
  If it does not exist, you may need to create it using CL01 (Create Class).
  
  
  
  Review Configuration:
  
  Check the configuration settings in the SPRO (SAP Project Reference Object) for the relevant modules to ensure that everything is set up correctly.
  Ensure that the classification system is properly configured.
  
  
  
  User Authorizations:
  
  Verify that the user has the necessary authorizations to access the class and perform the required actions.
  You may need to consult with your SAP security team to ensure proper roles and permissions are assigned.
  
  
  
  Data Consistency Check:
  
  Run consistency checks on the material master data and classification data to identify any discrepancies.
  Use transaction codes like MM03 (Display Material) to check the material data and ensure that all required fields are populated correctly.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message. There may be patches or updates that resolve known issues.
  
  
  
  Debugging:
  
  If you have access to debugging tools, you can analyze the program logic to identify where the error is being triggered.
  
  
  
  Related Information:
  
  Transaction Codes: CL01, CL02, CL03, MM03, SPRO
  SAP Notes: Always check for relevant SAP Notes that may provide additional insights or solutions.
  Documentation: Review SAP documentation related to classification and material management for best practices and troubleshooting steps.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP support team or reach out to SAP support for further assistance.