How To Fix /IWBEP/CM_V4_MED247 - Return of action '&1' not complex type based

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 247

• Message text: Return of action '&1' not complex 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_MED247 - Return of action '&1' not complex type based ?

  The SAP error message /IWBEP/CM_V4_MED247 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 based on a complex type. This typically occurs when the action is expected to return a complex type but is instead returning a primitive type or an unsupported structure.
  Cause:
  
  Incorrect Return Type Definition: The action in the OData service is defined to return a complex type, but the implementation is returning a primitive type (like a string, integer, etc.) or an unsupported structure.
  Service Metadata Issues: The service metadata may not be correctly defined, leading to mismatches between the expected and actual return types.
  Model Configuration: The OData model may not be properly configured to handle the expected complex type.
  
  Solution:
  
  
  Check Action Definition: Review the action definition in the OData service. Ensure that the return type is correctly defined as a complex type in the service metadata (e.g., in the service's EDM model).
  
  
  Implement Correct Return Type: If the action is supposed to return a complex type, ensure that the implementation of the action in the backend (ABAP code) returns the correct structure. This may involve creating an appropriate structure or class that matches the expected complex type.
  
  
  Update Service Metadata: If changes are made to the action or its return type, regenerate the service metadata. This can usually be done by reactivating the service or using transaction /IWFND/MAINT_SERVICE to update the service.
  
  
  Test the Action: After making the necessary changes, test the action again to ensure that it returns the expected complex type without errors.
  
  
  Check for Dependencies: Ensure that any dependent types or structures are also correctly defined and available in the OData service.
  
  
  Related Information:
  
  OData Service Development: Familiarize yourself with OData service development in SAP, including how to define actions and their return types.
  SAP Gateway: Understanding the SAP Gateway framework can help in troubleshooting issues related to OData services.
  ABAP Development: Knowledge of ABAP programming is essential for implementing the backend logic of OData services.
  
  If the issue persists after following these steps, consider checking SAP Notes or reaching out to SAP support for further assistance.