How To Fix /IWFND/CM_MGW_RT111 - Association name: '&1' ABAP field name '&2' already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW_RT -

• Message number: 111

• Message text: Association name: '&1' ABAP field name '&2' 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 /IWFND/CM_MGW_RT111 - Association name: '&1' ABAP field name '&2' already exists ?

  The SAP error message /IWFND/CM_MGW_RT111 indicates that there is a conflict in the definition of an association in your OData service. Specifically, it means that an association name and an ABAP field name are already defined in the context of your OData model, leading to a naming collision.
  Cause:
  
  Duplicate Association or Field Names: The error typically arises when you have defined an association in your OData model that has the same name as an existing field in the same entity or in a related entity.
  Model Definition Issues: This can occur due to incorrect or overlapping definitions in your data model, especially if you are using the same names for different purposes.
  Changes in the Data Model: If you have recently modified your data model (e.g., added new associations or fields), it may lead to conflicts with existing definitions.
  
  Solution:
  
  Check for Duplicates: Review your OData service's metadata and check for any duplicate association names or field names. Ensure that each association and field has a unique name.
  Rename Conflicting Elements: If you find duplicates, rename either the association or the field to resolve the conflict. Make sure that the new names are unique within the context of the OData model.
  Regenerate the Service: After making changes, regenerate the OData service to ensure that the changes are reflected in the service metadata.
  Clear Cache: Sometimes, caching issues can cause old definitions to persist. Clear the cache of the OData service and the SAP Gateway to ensure that the latest definitions are being used.
  Check Related Entities: If the association is related to another entity, ensure that there are no naming conflicts in the related entity as well.
  
  Related Information:
  
  OData Service Metadata: You can view the metadata of your OData service by accessing the service URL with $metadata appended (e.g., http://<host>:<port>/sap/opu/odata/sap/<service_name>/$metadata).
  Transaction Codes: Use transaction codes like /IWFND/MAINT_SERVICE to manage your OData services and check their configurations.
  Debugging: If the issue persists, consider using debugging tools in SAP to trace the execution and identify where the conflict arises.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly without naming conflicts.