How To Fix /IWBEP/CM_V4_APPS020 - Read reference via navigation '&1' not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4_APPS -

• Message number: 020

• Message text: Read reference via navigation '&1' not supported

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4_APPS020 - Read reference via navigation '&1' not supported ?

  The SAP error message /IWBEP/CM_V4_APPS020 Read reference via navigation '&1' not supported typically occurs in the context of OData services when there is an attempt to access a navigation property that is not supported or not properly defined in the OData service.
  Cause:
  
  Unsupported Navigation: The navigation property you are trying to access does not exist or is not defined in the OData model.
  Incorrect OData Service Configuration: The OData service may not be configured correctly to expose the navigation properties.
  Model Definition Issues: There may be issues in the underlying data model or entity definitions that prevent the navigation from being recognized.
  Service Versioning: If you are using a specific version of the OData service, the navigation property may not be available in that version.
  
  Solution:
  
  Check OData Model: Verify that the navigation property you are trying to access is defined in the OData model. You can do this by checking the metadata of the OData service.
  Update Service: If the navigation property is missing, you may need to update the OData service to include it. This may involve modifying the underlying ABAP code or the service definition in the SAP Gateway.
  Check Service Activation: Ensure that the OData service is properly activated in the SAP Gateway. You can do this using transaction /IWFND/MAINT_SERVICE.
  Review Entity Relationships: Check the relationships between entities in the data model to ensure that they are correctly defined and that the navigation properties are properly set up.
  Test with Different Versions: If applicable, try accessing the OData service with a different version to see if the navigation property is available in that version.
  Debugging: If you have access to the backend, you can debug the OData service to see where the error is occurring and gather more information about the issue.
  
  Related Information:
  
  OData Metadata: You can access the OData service metadata by appending $metadata to the service URL. This will provide you with a complete view of the entities and their relationships.
  SAP Gateway: Familiarize yourself with the SAP Gateway and how it handles OData services, including the configuration and activation of services.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific OData service you are using.
  Documentation: Refer to the official SAP documentation for OData services and the specific version of SAP you are using for more detailed guidance.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution.