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

/IWBEP/CM_V4S_RUN021 - Overview

• 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

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/IWBEP/CM_V4S_RUN021 - Details

• 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