How To Fix /IWBEP/SBDSP_DM028 - Key property &1 does not have an Output mapping in the Query operation

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/SBDSP_DM -

• Message number: 028

• Message text: Key property &1 does not have an Output mapping in the Query operation

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/SBDSP_DM028 - Key property &1 does not have an Output mapping in the Query operation ?

  The SAP error message /IWBEP/SBDSP_DM028 indicates that there is a problem with the output mapping of a key property in a query operation within an OData service. This typically occurs when the OData service is trying to return data, but the specified key property does not have a corresponding output mapping defined in the service's metadata.
  Cause:
  
  Missing Output Mapping: The key property specified in the error message does not have an output mapping defined in the OData service. This means that the service does not know how to serialize this property into the response.
  Incorrect Configuration: The OData service might be incorrectly configured, or the data model might not be properly defined.
  Changes in Data Model: If there have been recent changes to the underlying data model or the OData service definition, it may lead to inconsistencies in the output mapping.
  
  Solution:
  
  Check the Data Model: Ensure that the key property is correctly defined in the data model. Verify that it is marked as a key in the entity type definition.
  Define Output Mapping: If the key property is missing an output mapping, you need to define it in the service's metadata. This can typically be done in the service definition or the corresponding CDS view.
  Regenerate the Service: If you have made changes to the data model or the service definition, regenerate the OData service to ensure that all mappings are updated.
  Check Annotations: Ensure that the necessary annotations for the key property are present in the service definition. Annotations can affect how properties are serialized in the OData response.
  Debugging: Use transaction /IWFND/ERROR_LOG to check for additional error messages or logs that might provide more context about the issue.
  
  Related Information:
  
  OData Service Definition: Familiarize yourself with the OData service definition and how to configure entity types and properties.
  SAP Gateway: Understanding the SAP Gateway framework can help in troubleshooting OData service issues.
  CDS Views: If you are using Core Data Services (CDS) views, ensure that the views are correctly defined and activated.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide guidance on similar error messages.
  
  By following these steps, you should be able to resolve the error message /IWBEP/SBDSP_DM028 and ensure that your OData service functions correctly.