How To Fix /IWBEP/CM_MGW_RT128 - Inheritance for entity '&1' already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_MGW_RT -

• Message number: 128

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

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 /IWBEP/CM_MGW_RT128 - Inheritance for entity '&1' already exists ?

  The SAP error message /IWBEP/CM_MGW_RT128 indicates that there is an issue with the inheritance of an entity in the OData service. Specifically, the message states that inheritance for the specified entity (&1) already exists. This typically occurs in the context of the SAP Gateway and OData services when there is an attempt to define or register an entity that has already been defined or inherited.
  Cause:
  
  Duplicate Entity Definition: The entity you are trying to define or register has already been defined in the OData model.
  Model Configuration Issues: There may be issues in the configuration of the OData model, such as incorrect or duplicate entries in the metadata.
  Changes in the Data Model: If there have been recent changes to the data model, such as adding or modifying entities, it may lead to conflicts in inheritance.
  
  Solution:
  
  Check Entity Definitions: Review the entity definitions in your OData service to ensure that the entity in question is not already defined. Look for duplicate entries in the service's metadata.
  Clear Cache: Sometimes, the issue may be related to caching. Clear the cache of the OData service and regenerate the service to ensure that the latest definitions are being used.
  Review Inheritance Structure: If you are using inheritance in your data model, ensure that the inheritance structure is correctly defined and that there are no conflicts.
  Adjust Model Configuration: If you find any duplicate or conflicting entries in the model configuration, adjust them accordingly to resolve the conflict.
  Regenerate the Service: After making changes, regenerate the OData service to ensure that the changes take effect.
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like /IWFND/MAINT_SERVICE to manage OData services and check their configurations.
  Debugging: Use the SAP Gateway Client (transaction /IWFND/GW_CLIENT) to test the OData service and see if the error persists after making changes.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling entity inheritance issues.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the steps you have already taken.