How To Fix /IWFND/CM_MGW_RT161 - Type '&1' provided by the app is not a strcuture (Type KIND_STRUCT)

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 161

• Message text: Type '&1' provided by the app is not a strcuture (Type KIND_STRUCT)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_MGW_RT161 - Type '&1' provided by the app is not a strcuture (Type KIND_STRUCT) ?

  The SAP error message /IWFND/CM_MGW_RT161 indicates that there is an issue with the data type being used in an OData service. Specifically, the error message states that the type provided by the application is not a structure (Type KIND_STRUCT). This typically occurs in the context of SAP Gateway and OData services when the expected data type does not match the actual data type being provided.
  Cause:
  
  
  Incorrect Data Type Definition: The type being returned or expected in the OData service is not defined as a structure in the ABAP backend. This could happen if the data type is defined as a primitive type (like string, integer, etc.) instead of a structured type.
  
  
  Model Mismatch: There may be a mismatch between the data model defined in the OData service and the actual data being returned from the backend. If the service is expecting a structured type but receives a primitive type, this error will occur.
  
  
  Service Implementation Issues: If the service implementation (e.g., the method that fetches data) is incorrectly returning a primitive type instead of a structured type, this error will also be triggered.
  
  
  Solution:
  
  
  Check Data Type Definitions: Review the data types defined in the OData service. Ensure that the type being returned is defined as a structure in the ABAP Dictionary (SE11) and that it matches the expected structure in the OData service.
  
  
  Adjust Service Implementation: If the service implementation is returning a primitive type, modify the implementation to return the correct structured type. This may involve changing the method that fetches the data to ensure it returns a structured format.
  
  
  Regenerate the OData Service: After making changes to the data types or service implementation, regenerate the OData service using transaction /IWFND/MAINT_SERVICE to ensure that the changes are reflected in the service metadata.
  
  
  Test the Service: After making the necessary adjustments, test the OData service again to ensure that the error is resolved.
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  /IWFND/MAINT_SERVICE: To maintain OData services.
  SE11: To check and modify data types in the ABAP Dictionary.
  
  
  
  Debugging: Use the SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test the OData service and see the raw responses. This can help identify if the data being returned is in the expected format.
  
  
  Documentation: Refer to SAP Help documentation on OData services and data types for more detailed information on how to define and implement structured types.
  
  
  By following these steps, you should be able to resolve the error and ensure that your OData service is functioning correctly.