How To Fix C$731 - The reference object class type &, class & is not defined

SAP Error Message - Details

• Message type: E = Error

• Message class: C$ -

• Message number: 731

• Message text: The reference object class type &, class & is not defined

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message C$731 - The reference object class type &, class & is not defined ?

  The SAP error message C$731 indicates that there is an issue with a reference object class type that is not defined in the system. This error typically occurs in the context of classification and object management within SAP, particularly when dealing with classification systems, material management, or similar modules.
  Cause:
  
  Undefined Class Type: The class type specified in the error message is not defined in the system. This could happen if the class type was deleted or never created.
  Incorrect Configuration: There may be a configuration issue where the class type is not properly set up in the system.
  Transport Issues: If the class type was supposed to be transported from another system (like a development or quality system) and the transport did not occur successfully, it may lead to this error.
  Authorization Issues: Sometimes, the user may not have the necessary authorizations to access the class type, leading to the perception that it is not defined.
  
  Solution:
  
  
  Check Class Type Definition:
  
  Go to transaction code CL02 (Change Class) or CL01 (Create Class) and check if the class type mentioned in the error message exists.
  If it does not exist, you may need to create it or restore it from a backup if it was deleted.
  
  
  
  Review Configuration:
  
  Ensure that the class type is correctly configured in the system. This includes checking the settings in the classification system and ensuring that all necessary attributes and characteristics are defined.
  
  
  
  Transport Management:
  
  If the class type was supposed to be transported, check the transport logs to ensure that the transport was successful. If it failed, you may need to re-transport the relevant objects.
  
  
  
  Authorization Check:
  
  Verify that the user encountering the error has the necessary authorizations to access the class type. This can be done by checking the user roles and authorizations in transaction SU01.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to classification and object management for any specific guidance or known issues related to the error.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance, especially if this is a production environment.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  CL01 - Create Class
  CL02 - Change Class
  CL03 - Display Class
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the SAP Help Portal for information on classification and object management.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.