How To Fix /IWBEP/CM_V4S_RUN021 - Expand for navigation '&1': $$select has not been processed

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4S_RUN -

• Message number: 021

• Message text: Expand for navigation '&1': $$select has not been processed

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4S_RUN021 - Expand for navigation '&1': $$select has not been processed ?

  The SAP error message /IWBEP/CM_V4S_RUN021 typically occurs in the context of OData services when there is an issue with the processing of a $select statement in a query. This error indicates that the system was unable to process the $select option for navigation properties, which can be due to various reasons.
  Causes:
  
  Invalid Navigation Property: The navigation property specified in the $select statement may not exist or may be incorrectly referenced.
  Service Metadata Issues: The OData service metadata might not be correctly defined, leading to issues in interpreting the navigation properties.
  Authorization Issues: The user may not have the necessary authorizations to access the specified navigation properties.
  Data Model Changes: Changes in the underlying data model (like changes in the entity relationships) that are not reflected in the OData service can lead to this error.
  Incorrect Query Structure: The structure of the query may not conform to the expected OData query syntax.
  
  Solutions:
  
  Check Navigation Properties: Verify that the navigation properties you are trying to access in the $select statement are correctly defined in the OData service metadata.
  Review Service Metadata: Use the service's metadata URL (usually ending in $metadata) to inspect the entity types and navigation properties to ensure they are correctly defined.
  Authorization Check: Ensure that the user executing the query has the necessary authorizations to access the navigation properties.
  Update OData Service: If there have been changes to the underlying data model, ensure that the OData service is updated and re-generated to reflect those changes.
  Correct Query Syntax: Review the query syntax to ensure it adheres to OData standards. Make sure that the $select statement is correctly formatted.
  
  Related Information:
  
  OData Documentation: Familiarize yourself with the OData protocol and its query options, especially $select and navigation properties.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific version of the OData service you are using.
  Debugging Tools: Use tools like SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test and debug OData queries directly.
  Logs and Traces: Check the application logs and traces in SAP to gather more information about the error context.
  
  By following these steps, you should be able to identify the root cause of the error and implement the appropriate solution.