How To Fix /IWFND/CM_V4_RUNTIME005 - Expand/Select not supported for functions

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_V4_RUNTIME -

• Message number: 005

• Message text: Expand/Select not supported for functions

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_V4_RUNTIME005 - Expand/Select not supported for functions ?

  The SAP error message /IWFND/CM_V4_RUNTIME005 indicates that the Expand/Select operation is not supported for the function you are trying to access in an OData service. This typically occurs when you are trying to use the $expand or $select query options in an OData request, but the underlying function or entity does not support these operations.
  Cause:
  
  Function Import Limitation: The OData service is based on a function import that does not support the $expand or $select options. Function imports are typically used to execute specific operations and may not return complex types that can be expanded.
  Service Definition: The OData service might not be defined to allow for these operations. This can happen if the service is designed to return a single entity or a simple type.
  Model Configuration: The OData model may not be configured correctly to handle the requested operations.
  
  Solution:
  
  Check the OData Service Definition: Review the service definition in the SAP Gateway Service Builder (transaction code SEGW) to ensure that the function import is set up correctly. If you need to support $expand or $select, consider using an entity set instead of a function import.
  Modify the Request: If the function import does not support $expand or $select, modify your OData request to remove these options. Instead, call the function import directly without trying to expand or select specific fields.
  Use Entity Sets: If you need to retrieve related data, consider using an entity set that supports these operations instead of a function import.
  Check for Updates: Ensure that you are using the latest version of the OData service and that any relevant notes or patches from SAP have been applied.
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles entity sets and function imports can help clarify why certain operations are not supported.
  SAP Gateway Documentation: Refer to the official SAP Gateway documentation for more details on how to define and implement OData services, including the limitations of function imports.
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the error and understand the limitations of the OData service you are working with.