How To Fix /IWBEP/CM_MED029 - Class must not be used because interface '&1' not implemented

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_MED -

• Message number: 029

• Message text: Class must not be used because interface '&1' not implemented

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_MED029 - Class must not be used because interface '&1' not implemented ?

  The SAP error message /IWBEP/CM_MED029 Class must not be used because interface '&1' not implemented typically occurs in the context of SAP Gateway and OData services. This error indicates that a class is being used that does not implement a required interface, which is necessary for the proper functioning of the OData service.
  Cause:
  
  Missing Interface Implementation: The class in question is expected to implement a specific interface (denoted by &1 in the error message), but it does not. This can happen if the class was not properly defined or if the interface was not implemented in the class definition.
  Incorrect Class Usage: The class may be incorrectly configured in the OData service or in the service definition.
  Development Errors: If the class was recently modified or created, there may have been an oversight in implementing the required interfaces.
  
  Solution:
  
  
  Check Class Implementation:
  
  Go to the class mentioned in the error message.
  Verify that the required interface (indicated by &1) is implemented in the class. You can do this by checking the class definition in the ABAP Workbench (transaction SE80 or SE24).
  If the interface is not implemented, you need to implement it. This may involve adding the necessary methods defined in the interface to your class.
  
  
  
  Adjust OData Service Configuration:
  
  Ensure that the OData service is correctly configured to use the class that implements the required interface.
  You can check the service configuration in transaction /IWFND/MAINT_SERVICE and ensure that the correct class is assigned.
  
  
  
  Rebuild the Service:
  
  After making changes to the class, you may need to regenerate the OData service. This can be done using transaction /IWFND/MAINT_SERVICE to activate the service again.
  You can also use transaction /IWBEP/REG_SERVICE to register and activate the service.
  
  
  
  Check for Dependencies:
  
  Ensure that there are no other dependencies or configurations that might be causing the issue. Sometimes, other classes or interfaces may also need to be checked.
  
  
  
  Testing:
  
  After implementing the necessary changes, test the OData service again to ensure that the error is resolved.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SE80: Object Navigator (for checking class definitions)
  SE24: Class Builder (for class implementation)
  /IWFND/MAINT_SERVICE: Service Maintenance (for managing OData services)
  /IWBEP/REG_SERVICE: Service Registration (for registering OData services)
  
  
  
  Documentation: Refer to SAP Help documentation for OData services and Gateway development for more detailed guidance on implementing interfaces and configuring services.
  
  
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message or provide additional troubleshooting steps.
  
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly.