How To Fix MY_CATS004 - The message class & does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: MY_CATS - Message Class for CATS notebook

• Message number: 004

• Message text: The message class & does not exist

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 MY_CATS004 - The message class & does not exist ?

  The SAP error message MY_CATS004, which states "The message class & does not exist," typically indicates that the system is trying to reference a message class that has not been defined or is not available in the SAP system. This can occur in various contexts, such as during the execution of a program, transaction, or report.
  Cause:
  
  Missing Message Class: The specified message class (in this case, represented by the & symbol) has not been created or is not available in the system.
  Incorrect Configuration: The system might be configured incorrectly, leading to a reference to a non-existent message class.
  Transport Issues: If the message class was supposed to be transported from another system (like Development to Production) and the transport did not occur, it may lead to this error.
  Custom Development: If the error arises from custom development, the developer may have referenced a message class that was not created.
  
  Solution:
  
  
  Check Message Class: 
  
  Use transaction code SE91 to check if the message class exists. Enter the name of the message class in the "Message Class" field and see if it is available.
  If it does not exist, you may need to create it using transaction SE91.
  
  
  
  Create Message Class:
  
  If the message class is missing, you can create it by:
  
  Going to transaction SE91.
  Entering a name for the new message class.
  Defining the messages you need within that class.
  
  
  
  
  
  Check Custom Code: 
  
  If the error is coming from custom code, review the code to ensure that it references the correct message class. Update the code if necessary.
  
  
  
  Transport Requests: 
  
  If the message class was supposed to be transported, check the transport requests to ensure that they were successfully imported into the target system.
  
  
  
  Consult Documentation: 
  
  If the message class is part of a standard SAP module or enhancement, consult the relevant SAP documentation or support notes for guidance.
  
  
  
  Contact SAP Support: 
  
  If you are unable to resolve the issue, consider reaching out to SAP support for assistance, especially if this is affecting critical business processes.
  
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SE91: Message Class Maintenance
  SE80: Object Navigator (to check for related objects)
  
  
  
  SAP Notes: 
  
  Check SAP Notes for any known issues or patches related to the specific message class or error.
  
  
  
  Custom Development: 
  
  If you are working with custom developments, ensure that all developers are aware of the message classes being used and that they are properly documented.
  
  
  
  By following these steps, you should be able to identify the cause of the MY_CATS004 error and implement a solution.