How To Fix /STTPEC/ODATA023 - Function return type '&1' not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: /STTPEC/ODATA -

• Message number: 023

• Message text: Function return type '&1' not supported

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /STTPEC/ODATA023 - Function return type '&1' not supported ?

  The SAP error message /STTPEC/ODATA023 Function return type '&1' not supported typically occurs in the context of OData services when the return type of a function or operation is not recognized or supported by the OData framework in SAP. This can happen for various reasons, including incorrect data types, unsupported return types, or issues with the service definition.
  Causes:
  
  Unsupported Return Type: The function or operation is defined to return a data type that is not supported by the OData service. For example, complex types or certain custom types may not be recognized.
  Incorrect Metadata: The metadata of the OData service may not be correctly defined, leading to mismatches between expected and actual return types.
  Configuration Issues: There may be configuration issues in the OData service or the underlying data model that prevent the correct return type from being recognized.
  Version Compatibility: The version of the OData service or the SAP system may not support certain return types, especially if you are using an older version of SAP.
  
  Solutions:
  
  Check Return Type Definition: Review the function or operation definition in the OData service to ensure that the return type is supported. If it is a custom type, consider changing it to a supported type.
  Update Metadata: Regenerate the metadata for the OData service to ensure that it reflects the current definitions and types. This can often be done through transaction /IWFND/MAINT_SERVICE or similar.
  Use Supported Types: If you are using complex types or custom types, consider using simpler, supported types (like primitive types) for the return value.
  Debugging: Use debugging tools to trace the execution of the OData service and identify where the unsupported return type is being triggered.
  Check SAP Notes: Look for relevant SAP Notes or documentation that may address this specific error or provide guidance on supported return types for your version of SAP.
  Consult Documentation: Review the OData documentation for your specific SAP version to understand the supported return types and any limitations.
  
  Related Information:
  
  OData Service Configuration: Familiarize yourself with the configuration of OData services in SAP, including how to define and manage service operations and their return types.
  SAP Community: Engage with the SAP Community forums or support channels to see if others have encountered similar issues and what solutions they have found.
  SAP Help Portal: Utilize the SAP Help Portal for detailed documentation on OData services, including best practices for defining return types and handling errors.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.