How To Fix /IWBEP/CM_V4S_RUN016 - Expand/Select only supported for actions returning entity (collection)

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4S_RUN -

• Message number: 016

• Message text: Expand/Select only supported for actions returning entity (collection)

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4S_RUN016 - Expand/Select only supported for actions returning entity (collection) ?

  The SAP error message /IWBEP/CM_V4S_RUN016 typically occurs in the context of OData services when you are trying to use the $expand or $select query options on an action that does not return an entity or a collection of entities. This error indicates that the action you are trying to call is not designed to support these query options.
  Cause:
  
  Action Type: The action you are invoking is defined in the OData service as a function or action that does not return an entity or a collection of entities. Instead, it may return a primitive type or a complex type.
  Incorrect Usage: You might be trying to use $expand or $select on an action that is not designed to handle these options. These options are typically used with entity sets or entity types, not with actions.
  
  Solution:
  
  Check the Action Definition: Review the OData service definition to confirm the return type of the action you are calling. Ensure that it is defined to return an entity or a collection of entities if you intend to use $expand or $select.
  Modify the Request: If the action is not supposed to return an entity or collection, remove the $expand or $select options from your request. Instead, call the action directly without these query options.
  Update the Service: If you need the action to return an entity or collection, consider modifying the OData service implementation to change the return type of the action. This may involve changes in the backend logic and the service definition.
  Consult Documentation: Refer to the SAP documentation for OData services to understand the correct usage of actions and the limitations regarding $expand and $select.
  
  Related Information:
  
  OData Protocol: Understanding the OData protocol and how it handles entities, actions, and functions can help clarify the limitations and capabilities of your service.
  SAP Gateway: If you are working with SAP Gateway, familiarize yourself with the service builder (SEGW) and how to define actions and their return types.
  Debugging: Use transaction codes like /IWFND/ERROR_LOG to check for additional error details or logs that might provide more context on the issue.
  
  By following these steps, you should be able to resolve the error and correctly implement the desired functionality in your OData service.