How To Fix /IWBEP/CM_V4_MED244 - Parameter '&1' on action '&2' is not entity type based

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_MED -

• Message number: 244

• Message text: Parameter '&1' on action '&2' is 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_MED244 - Parameter '&1' on action '&2' is not entity type based ?

  The SAP error message /IWBEP/CM_V4_MED244 typically occurs in the context of OData services when there is an issue with the parameters being passed to an action in the service. The message indicates that a parameter (denoted as &1) for a specific action (denoted as &2) is not based on an entity type. This can happen for several reasons, and understanding the cause is crucial for resolving the issue.
  Cause
  
  
  Incorrect Parameter Type: The parameter being passed to the action is not defined as an entity type in the OData service metadata. This could happen if the parameter is expected to be an entity but is defined as a primitive type or complex type instead.
  
  
  Service Definition Issues: There may be a mismatch between the service definition and the actual implementation. If the OData service is not correctly defined in the service metadata, it can lead to this error.
  
  
  Incorrect Action Call: The action being called may not be set up to accept the parameters being passed. This could be due to a misconfiguration in the service or an incorrect client request.
  
  
  Versioning Issues: If there are multiple versions of the OData service, the client may be calling an outdated version that does not support the parameters being used.
  
  
  Solution
  
  
  Check OData Service Metadata: Review the OData service metadata (usually accessible via the $metadata endpoint) to ensure that the parameter being passed is defined as an entity type. If it is not, you may need to adjust the service definition.
  
  
  Update Service Definition: If the parameter should indeed be an entity type, update the service definition in the relevant ABAP class or service implementation to ensure that it is correctly defined.
  
  
  Validate Action Implementation: Ensure that the action being called is implemented correctly and is set up to accept the parameters being passed. Check the method signature in the ABAP class to confirm that it matches the expected input.
  
  
  Test with Correct Parameters: If you are testing the service using a tool like Postman or SAP Gateway Client, ensure that you are passing the correct parameters as defined in the service metadata.
  
  
  Check for Versioning Issues: If applicable, ensure that you are using the correct version of the OData service that supports the parameters you are trying to use.
  
  
  Debugging: If the issue persists, consider debugging the OData service implementation to trace the flow of data and identify where the mismatch occurs.
  
  
  Related Information
  
  OData Service Documentation: Review the official SAP documentation on OData services for best practices and guidelines on defining entity types and actions.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and to find potential solutions.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or bugs related to the specific version of the OData service you are using.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.