/IWFND/CM_MGW_RT128 - Inheritance for entity '&1' already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 128

• Message text: Inheritance for entity '&1' already exists

Self-Explanatory Message

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AnswerBot

• What is the cause and solution for SAP error message /IWFND/CM_MGW_RT128 - Inheritance for entity '&1' already exists ?

  The SAP error message /IWFND/CM_MGW_RT128 indicates that there is an issue with the inheritance of an entity in the OData service. Specifically, it means that the inheritance for the specified entity already exists, which can occur in various scenarios when working with OData services in SAP Gateway.
  Cause:
  
  
  Duplicate Inheritance Definition: The error typically arises when there is an attempt to define an inheritance relationship for an entity that has already been defined. This can happen if:
  
  The entity is already part of another inheritance hierarchy.
  There are multiple definitions or attempts to redefine the same inheritance in the service.
  
  
  
  Model Changes: If the data model has been modified (e.g., adding or changing inheritance relationships) without properly updating the service or regenerating the metadata, it can lead to inconsistencies.
  
  
  Service Registration Issues: Sometimes, issues with the service registration or activation can lead to this error, especially if the service was not properly activated after changes.
  
  
  Solution:
  
  
  Check Entity Definitions: Review the entity definitions in your OData model to ensure that you are not trying to redefine an inheritance relationship that already exists. Look for duplicate entries or conflicting definitions.
  
  
  Regenerate the Service: If you have made changes to the data model, regenerate the OData service:
  
  Go to the transaction code /IWFND/MAINT_SERVICE.
  Find your service and select it.
  Click on "Regenerate" to update the service with the latest model changes.
  
  
  
  Clear Cache: Sometimes, clearing the cache can resolve issues related to outdated metadata:
  
  Use transaction code /IWFND/CACHE to clear the cache for the OData service.
  
  
  
  Check for Active Services: Ensure that there are no other active services that might be conflicting with the current service. Deactivate any unnecessary services.
  
  
  Review Inheritance Hierarchies: If you are using inheritance in your data model, carefully review the hierarchy to ensure that it is correctly defined and does not have circular references or conflicts.
  
  
  Debugging: If the issue persists, consider debugging the OData service to trace where the error is being triggered. This may provide more insight into the specific cause.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to OData service issues and inheritance errors. There may be specific patches or updates that address known issues.
  Documentation: Review the SAP Gateway documentation for best practices on defining entities and inheritance in 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 error related to entity inheritance in your SAP OData service.