/IWFND/CM_MGW_RT129 - Class element ID '&1' does not exist in class '&2'

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 129

• Message text: Class element ID '&1' does not exist in class '&2'

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.

Unfortunately, there isn't any extra information in this error notice.

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AnswerBot

• What is the cause and solution for SAP error message /IWFND/CM_MGW_RT129 - Class element ID '&1' does not exist in class '&2' ?

  The SAP error message /IWFND/CM_MGW_RT129 Class element ID '&1' does not exist in class '&2' typically occurs in the context of SAP Gateway services, particularly when dealing with OData services. This error indicates that the system is trying to access a class element (like a property or field) that is not defined in the specified class.
  Cause:
  
  Missing Class Element: The specified class element ID (&1) does not exist in the class (&2). This could be due to a typo, a misconfiguration, or an incomplete implementation of the OData service.
  Changes in Data Model: If the underlying data model has changed (e.g., fields were removed or renamed), the OData service may still reference the old fields.
  Service Registration Issues: The OData service may not be properly registered or activated in the SAP Gateway.
  Versioning Issues: If there are multiple versions of the service, the wrong version might be called, leading to discrepancies in the expected class elements.
  
  Solution:
  
  Check Class Definition: Verify that the class element ID exists in the specified class. You can do this by navigating to the relevant ABAP class in the SAP system and checking its attributes.
  Update OData Service: If the class element has been removed or renamed, update the OData service definition to reflect the current data model. This may involve regenerating the service or adjusting the mapping.
  Re-register the Service: If the service is not properly registered, you can re-register it using transaction code /IWFND/MAINT_SERVICE. Ensure that the service is activated and properly configured.
  Check Service Implementation: Review the implementation of the OData service to ensure that it correctly references the class elements. This may involve checking the methods in the service implementation class.
  Clear Cache: Sometimes, clearing the cache can resolve issues related to outdated service definitions. You can do this using transaction code /IWFND/CACHE to clear the OData cache.
  Debugging: If the issue persists, consider debugging the OData service to trace where the error occurs and gather more context about the missing class element.
  
  Related Information:
  
  Transaction Codes:
  
  /IWFND/MAINT_SERVICE: To manage OData services.
  /IWFND/CACHE: To clear the OData cache.
  
  
  SAP Notes: Check for any relevant SAP Notes that might address known issues related to this error message.
  Documentation: Review the SAP Gateway documentation for best practices on service implementation and troubleshooting.
  
  By following these steps, you should be able to identify the root cause of the error and implement a solution to resolve it.