How To Fix /IWFND/CM_DESIGNTIME102 - Attribute name '&1' is not unique

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_DESIGNTIME -

• Message number: 102

• Message text: Attribute name '&1' is not unique

Self-Explanatory Message

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• What is the cause and solution for SAP error message /IWFND/CM_DESIGNTIME102 - Attribute name '&1' is not unique ?

  The SAP error message /IWFND/CM_DESIGNTIME102 Attribute name '&1' is not unique typically occurs in the context of SAP Gateway and OData services. This error indicates that there are multiple attributes with the same name defined in the data model, which violates the uniqueness requirement for attribute names in OData services.
  Cause:
  
  Duplicate Attribute Names: The most common cause of this error is that there are two or more attributes defined with the same name in the same entity type or in related entity types.
  Model Definition Issues: If you are using a CDS (Core Data Services) view or a similar data model definition, there might be overlapping names in the fields defined.
  Inconsistent Metadata: If the metadata of the OData service is not properly defined or has been modified without proper adjustments, it can lead to this error.
  
  Solution:
  
  Check Attribute Definitions: Review the entity type definitions in your OData service or CDS view. Ensure that all attribute names are unique within the same entity type.
  Rename Duplicates: If you find duplicate attribute names, rename them to ensure uniqueness. This may involve changing the name in the data model and updating any references to that attribute in your application.
  Regenerate Metadata: After making changes, regenerate the metadata for the OData service. This can often be done through transaction /IWFND/MAINT_SERVICE or by using the relevant tools in your development environment.
  Check Related Entities: If the attributes are in related entities, ensure that there are no naming conflicts across those entities as well.
  Clear Cache: Sometimes, clearing the cache of the OData service can help resolve issues related to stale metadata. You can do this using transaction /IWFND/CACHE.
  
  Related Information:
  
  OData Services: Understanding how OData services work in SAP Gateway is crucial. Familiarize yourself with the concepts of entity types, properties, and how they are defined in the service.
  SAP Gateway: Knowledge of SAP Gateway and its configuration can help in troubleshooting similar issues.
  CDS Views: If you are using CDS views, understanding how to define and manage them is important, as they are often the source of data for OData services.
  SAP Notes: Check for any relevant SAP Notes that might address specific issues related to this error message or provide additional guidance.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service functions correctly.