How To Fix OO671 - Message class &1 does not exist

SAP Error Message - Details

• Message type: E = Error

• Message class: OO - Class Builder/API

• Message number: 671

• Message text: Message class &1 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 OO671 - Message class &1 does not exist ?

  The SAP error message OO671, which states "Message class &1 does not exist," typically occurs when the system is trying to access a message class that has not been defined or does not exist in the SAP system. This can happen in various scenarios, such as during the execution of a program, transaction, or when customizing settings.
  Cause:
  
  Missing Message Class: The specified message class (indicated by &1 in the error message) has not been created or is not available in the system.
  Typographical Error: There may be a typo in the message class name being referenced.
  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 not exist in the target system.
  Authorization Issues: In some cases, the user may not have the necessary authorizations to access the message class.
  
  Solution:
  
  Check Message Class: Verify if the message class exists in the system. You can do this by using transaction code SE91 (Message Class Maintenance) to check if the message class is defined.
  Create Message Class: If the message class does not exist, you can create it using transaction SE91. Make sure to define the necessary messages within that class.
  Correct Typographical Errors: Double-check the code or configuration where the message class is being referenced to ensure there are no typos.
  Transport the Message Class: If the message class exists in another system, ensure that it is properly transported to the current system.
  Check Authorizations: Ensure that the user has the necessary authorizations to access the message class. This may involve checking roles and authorizations in transaction PFCG.
  
  Related Information:
  
  
  Transaction Codes:
  
  SE91: Message Class Maintenance
  SE80: Object Navigator (to check for related programs or objects)
  SE37: Function Module (if the message is being called from a function module)
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search for relevant notes in the SAP Support Portal.
  
  
  Debugging: If you have access to debugging tools, you can set breakpoints in the code where the message class is being called to further investigate the issue.
  
  
  By following these steps, you should be able to resolve the OO671 error and ensure that the message class is properly defined and accessible in your SAP system.