How To Fix /IWFND/CM_GSR011 - Framework cannot automatically generate an ID for relation '&1'

/IWFND/CM_GSR011 - Overview

• Message type: E = Error

• Message class: /IWFND/CM_GSR -

• Message number: 011

• Message text: Framework cannot automatically generate an ID for relation '&1'

Self-Explanatory Message

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/IWFND/CM_GSR011 - Details

• The SAP error message /IWFND/CM_GSR011 Framework cannot automatically generate an ID for relation '&1' typically occurs in the context of SAP Gateway and OData services. This error indicates that the framework is unable to automatically generate a unique identifier (ID) for a specific relation in your OData model. Here are some potential causes, solutions, and related information:
  Causes:
  
  Missing Key Definition: The entity or relation in question may not have a properly defined key. In OData, every entity must have a unique key to identify instances.
  Incorrect Model Configuration: The OData model might be incorrectly configured, leading to issues in generating IDs for relations.
  Data Annotations: There may be missing or incorrect annotations in the metadata that define how the relations should behave.
  Service Implementation Issues: If the service implementation does not correctly handle the creation of IDs for related entities, this error can occur.
  Versioning Issues: If there are discrepancies between the versions of the