How To Fix /IWFND/CM_DESIGNTIME161 - Old '&1' and new '&2' concatenated prefixes are equal

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_DESIGNTIME -

• Message number: 161

• Message text: Old '&1' and new '&2' concatenated prefixes are equal

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_DESIGNTIME161 - Old '&1' and new '&2' concatenated prefixes are equal ?

  The SAP error message /IWFND/CM_DESIGNTIME161 indicates that there is a conflict with the concatenated prefixes in the OData service design time. This typically occurs when there is an inconsistency in the naming conventions or configurations of the OData service, particularly when dealing with entity types or sets that have been modified.
  Cause:
  The error message suggests that there is an attempt to change the prefix of an entity or a service, but the old and new prefixes are the same. This can happen due to:
  
  Incorrect configuration in the OData service.
  Changes made to the service definition that do not reflect in the underlying data model.
  Issues with the service registration or metadata.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Service Configuration:
  
  Go to the SAP Gateway Service Builder (transaction code SEGW).
  Open the relevant project and check the entity types and sets for any inconsistencies in naming or prefixes.
  
  
  
  Regenerate the Service:
  
  If you have made changes to the entity types or their prefixes, regenerate the service.
  Right-click on the project and select "Generate Runtime Objects" to ensure that the changes are applied correctly.
  
  
  
  Clear Cache:
  
  Clear the cache of the OData service. You can do this by using transaction code /IWFND/CACHE and selecting the option to clear the cache for the specific service.
  
  
  
  Check Metadata:
  
  Ensure that the metadata of the OData service is correctly defined. You can check the metadata by accessing the service URL in a browser or using tools like Postman.
  
  
  
  Review Changes:
  
  If you have recently made changes to the service, review those changes to ensure that they are valid and do not conflict with existing definitions.
  
  
  
  Check for Duplicates:
  
  Ensure that there are no duplicate entity types or sets with the same name or prefix in the service.
  
  
  
  Transport Issues:
  
  If the issue arose after a transport, check if the transport included all necessary objects and configurations.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SEGW: Service Builder for OData services.
  /IWFND/CACHE: To manage the cache for OData services.
  
  
  
  Documentation:
  
  Refer to SAP Help documentation for OData services and Gateway for more detailed information on service configuration and troubleshooting.
  
  
  
  SAP Notes:
  
  Check for any relevant SAP Notes that might address this specific error or provide additional guidance.
  
  
  
  By following these steps, you should be able to resolve the error and ensure that your OData service is functioning correctly. If the problem persists, consider reaching out to SAP support for further assistance.