How To Fix /IWPGW/TGW_TCM_MSG005 - Return parameter expected to be a table type

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWPGW/TGW_TCM_MSG -

• Message number: 005

• Message text: Return parameter expected to be a table type

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWPGW/TGW_TCM_MSG005 - Return parameter expected to be a table type ?

  The SAP error message /IWPGW/TGW_TCM_MSG005 Return parameter expected to be a table type typically occurs in the context of SAP Gateway services, particularly when dealing with OData services. This error indicates that the return parameter of a function module or method is expected to be of a table type, but it is not being provided as such.
  Cause:
  
  Incorrect Return Type: The function module or method is defined to return a table type, but the implementation is returning a different type (e.g., a single value or a structure).
  Service Definition Issues: The OData service definition may not match the expected return type defined in the backend.
  Data Mapping Errors: There may be issues in the data mapping between the backend and the OData service, leading to incorrect data types being returned.
  
  Solution:
  
  
  Check Function Module/Method Definition: Verify the definition of the function module or method being called. Ensure that the return parameter is defined as a table type (e.g., TABLE OF <type>).
  
  
  Adjust Implementation: If the implementation is returning a single value or a structure, modify it to return a table. For example, if you are returning a single record, wrap it in an internal table.
  DATA: lt_return TYPE TABLE OF your_structure,
        ls_return TYPE your_structure.
  
  " Populate ls_return with data
  APPEND ls_return TO lt_return.
  
  " Return the internal table
  RETURN lt_return.
  
  
  Review OData Service Definition: Check the OData service definition in the SAP Gateway Service Builder (transaction code SEGW). Ensure that the entity set and the associated return types are correctly defined.
  
  
  Test the Service: After making changes, test the OData service again to ensure that the error is resolved.
  
  
  Debugging: If the issue persists, use debugging tools to trace the execution and identify where the return type mismatch is occurring.
  
  
  Related Information:
  
  SAP Gateway: Understand the architecture of SAP Gateway and how it interacts with OData services.
  OData Services: Familiarize yourself with OData service creation and consumption in SAP.
  ABAP Data Types: Review ABAP data types and how to define and use internal tables.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on this error.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service returns the expected table type.