How To Fix /IWFND/CM_DESIGNTIME151 - Relation '&1' does not exist in object model

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_DESIGNTIME -

• Message number: 151

• Message text: Relation '&1' does not exist in object model

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 /IWFND/CM_DESIGNTIME151 - Relation '&1' does not exist in object model ?

  The SAP error message /IWFND/CM_DESIGNTIME151 Relation '&1' does not exist in object model typically occurs in the context of SAP Gateway and OData services. This error indicates that the system is unable to find a specified relation in the object model of the OData service. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause:
  
  Missing Relation Definition: The relation specified in the error message does not exist in the data model of the OData service. This could be due to a missing association or navigation property in the service definition.
  Model Changes: If there have been recent changes to the underlying data model (like changes in the database tables or structures) without updating the OData service, it can lead to this error.
  Service Activation Issues: The OData service may not be properly activated or may not have been regenerated after changes were made to the data model.
  Incorrect Metadata: The metadata of the OData service might be out of sync with the actual data model.
  
  Solutions:
  
  Check the Data Model: Verify that the relation specified in the error message is correctly defined in the data model. Ensure that all associations and navigation properties are properly set up.
  Regenerate the Service: If changes were made to the underlying data model, regenerate the OData service. You can do this by:
  
  Going to the transaction code /IWFND/MAINT_SERVICE.
  Selecting the service and clicking on "Regenerate".
  
  
  Activate the Service: Ensure that the OData service is activated. You can check this in the same transaction (/IWFND/MAINT_SERVICE).
  Check Metadata: Use the OData service's metadata URL (e.g., /sap/opu/odata/sap/<service_name>/$metadata) to check if the relation is present in the metadata. If it’s missing, you may need to adjust the service definition.
  Clear Cache: Sometimes, clearing the cache can resolve issues related to outdated metadata. You can do this by using transaction /IWFND/CACHE to clear the cache for the OData service.
  Debugging: If the issue persists, consider debugging the service to trace where the error is occurring. This can provide insights into what might be going wrong.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to OData services and the specific error message for any known issues or patches.
  Documentation: Review the SAP Gateway documentation for best practices on defining and managing OData services.
  Community Forums: Engage with the SAP Community or forums for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the issue related to the error message /IWFND/CM_DESIGNTIME151.