How To Fix /IWBEP/CM_V4_RUNTIME146 - Target operation return is not a primitive collection

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_RUNTIME -

• Message number: 146

• Message text: Target operation return is not a primitive collection

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_RUNTIME146 - Target operation return is not a primitive collection ?

  The SAP error message /IWBEP/CM_V4_RUNTIME146 Target operation return is not a primitive collection typically occurs in the context of SAP Gateway and OData services. This error indicates that the response from an OData service operation is expected to return a primitive collection (like an array of simple data types), but instead, it is returning a different type of data structure (like an entity or complex type).
  Cause:
  
  Incorrect Return Type: The OData service is defined to return a primitive collection, but the implementation is returning a different type (e.g., an entity or complex type).
  Service Definition Mismatch: The service definition in the OData metadata does not match the actual implementation of the service.
  Model Configuration Issues: There may be issues in the way the OData model is configured, leading to mismatches in expected data types.
  
  Solution:
  
  
  Check Service Implementation: Review the implementation of the OData service to ensure that the return type matches the expected primitive collection. If the service is supposed to return a list of simple values (like strings or integers), ensure that it does so.
  
  
  Update Service Definition: If the service is correctly implemented but is returning a complex type, you may need to update the service definition in the OData metadata to reflect the correct return type.
  
  
  Modify the OData Model: If you are using a custom OData model, ensure that the model is correctly defined to handle the expected return types. This may involve adjusting the annotations or the structure of the model.
  
  
  Test with Different Clients: Sometimes, the issue may arise from the client consuming the OData service. Test the service with different clients (like Postman or SAP Gateway Client) to see if the issue persists.
  
  
  Debugging: Use debugging tools to trace the execution of the OData service and identify where the return type is being set incorrectly.
  
  
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as there may be bug fixes related to OData services.
  
  
  Related Information:
  
  SAP Gateway Documentation: Review the official SAP Gateway documentation for guidelines on defining and implementing OData services.
  OData Specification: Familiarize yourself with the OData protocol and its specifications, especially regarding data types and collections.
  SAP Community: Engage with the SAP Community forums to see if others have encountered similar issues and to find potential solutions.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.