How To Fix /IWBEP/CM_V4_MED250 - Return of function '&1' not complex type based

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 250

• Message text: Return of function '&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_MED250 - Return of function '&1' not complex type based ?

  The SAP error message /IWBEP/CM_V4_MED250 indicates that there is an issue with the return type of a function in an OData service. Specifically, the message states that the return of the function '&1' is not a complex type based, which means that the function is expected to return a complex type but is not doing so.
  Cause:
  
  Incorrect Return Type: The function module or method defined in the OData service is returning a simple type (like a string or integer) instead of a complex type (which is a structured type that can contain multiple fields).
  Service Definition Issues: The OData service might not be correctly defined in the service metadata, leading to mismatches between expected and actual return types.
  Model Configuration: The data model might not be properly configured to handle the expected complex type.
  
  Solution:
  
  
  Check Function Implementation: Review the implementation of the function or method that is causing the error. Ensure that it is returning a complex type as expected. If it is returning a simple type, modify it to return a complex type.
  
  
  Update Service Metadata: If the function is correctly implemented but the service metadata is outdated, regenerate the service metadata to ensure it reflects the current implementation.
  
  
  Review OData Model: Check the OData model configuration in the SAP Gateway. Ensure that the entity types and complex types are correctly defined and that the function is mapped to the correct return type.
  
  
  Test with Different Clients: Sometimes, the issue may be client-specific. Test the OData service using different clients (like Postman or SAP Gateway Client) to see if the error persists.
  
  
  Debugging: Use debugging tools in SAP to trace the execution of the function and identify where the return type is being set incorrectly.
  
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP and the importance of defining complex types in the service metadata.
  SAP Gateway: Familiarity with SAP Gateway and how it handles service definitions, including entity types and complex types.
  Function Module Documentation: Review the documentation for the specific function module or method to understand its expected return types and how to implement them correctly.
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting the SAP community for further assistance.