How To Fix /IWBEP/CM_V4_MED248 - Return of action '&1' not primitve type based

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 248

• Message text: Return of action '&1' not primitve type based

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED248 - Return of action '&1' not primitve type based ?

  The SAP error message /IWBEP/CM_V4_MED248 indicates that there is an issue with the return type of an action in an OData service. Specifically, the message states that the return of action '&1' is not of a primitive type based. This typically occurs when the action is expected to return a primitive type (like a string, integer, etc.), but instead, it is returning a complex type or an unsupported type.
  Cause:
  
  Incorrect Return Type Definition: The action in the OData service is defined to return a primitive type, but the implementation is returning a complex type or a different structure.
  Service Metadata Mismatch: The metadata definition of the OData service does not match the actual implementation, leading to discrepancies in expected return types.
  Model Configuration Issues: There may be issues in the way the OData model is configured, leading to incorrect type definitions.
  
  Solution:
  
  
  Check Action Definition: Review the action definition in the OData service. Ensure that the return type is correctly defined as a primitive type in the service metadata (e.g., Edm.String, Edm.Int32, etc.).
  
  
  Review Implementation: Check the implementation of the action in the backend. Ensure that the return value is indeed a primitive type and not a complex type or structure.
  
  
  Update Metadata: If there have been changes to the action's return type, ensure that the service metadata is updated accordingly. You may need to regenerate the service metadata or refresh the OData service.
  
  
  Test the Action: After making the necessary changes, test the action again to ensure that it returns the expected primitive type.
  
  
  Check for Annotations: If you are using annotations, ensure that they are correctly defined and do not conflict with the expected return type.
  
  
  Related Information:
  
  OData Service Documentation: Review the OData service documentation for guidelines on defining actions and their return types.
  SAP Notes: Check SAP Notes for any known issues or updates related to this error message.
  Debugging: Use debugging tools in SAP to trace the execution of the action and identify where the return type is being set incorrectly.
  Community Forums: Consider checking SAP Community forums or other developer communities for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions as expected.