How To Fix /IWBEP/CM_V4_MED246 - Return of action '&1' not entity type based

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 246

• Message text: Return of action '&1' not entity type based

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_MED246 - Return of action '&1' not entity type based ?

  The SAP error message /IWBEP/CM_V4_MED246 typically indicates that there is an issue with the return type of an action in an OData service. Specifically, the message states that the return of the action is not based on an entity type, which is a requirement for certain actions in OData services.
  Cause:
  
  Action Return Type: The action defined in your OData service is expected to return an entity type, but it is currently returning a non-entity type (like a primitive type or a complex type).
  Service Definition: The service definition in the metadata might not be correctly configured to specify the return type of the action.
  Implementation Issues: The implementation of the action in the backend might not be aligned with the expected return type defined in the service.
  
  Solution:
  
  
  Check Action Definition: Review the action definition in your OData service. Ensure that the return type is set to an entity type. You can do this in the service's metadata or in the service definition in the SAP Gateway.
  
  
  Modify the Action Implementation: If the action is implemented in ABAP, ensure that the return type of the action method corresponds to an entity type. You may need to adjust the method to return an appropriate entity type instead of a primitive or complex type.
  
  
  Update Service Metadata: After making changes to the action definition or implementation, regenerate the service metadata. This can be done using transaction /IWFND/MAINT_SERVICE to ensure that the changes are reflected in the OData service.
  
  
  Test the Action: After making the necessary changes, test the action again to ensure that it now returns the expected entity type.
  
  
  Related Information:
  
  OData Services: Understanding the structure of OData services and how actions and entity types are defined is crucial. Familiarize yourself with the OData protocol and the specific requirements for actions.
  SAP Gateway: Knowledge of SAP Gateway and how it handles OData services can help in troubleshooting and resolving issues related to service definitions.
  Debugging: Use debugging tools in SAP to trace the execution of the action and identify where the return type is being set incorrectly.
  
  If you continue to face issues after following these steps, consider consulting SAP documentation or reaching out to SAP support for further assistance.