How To Fix CFD_DE_HANDLER012 - Extension &1 cannot be created. Name is already in use.

SAP Error Message - Details

• Message type: E = Error

• Message class: CFD_DE_HANDLER - Custom Fields: Data Source Extension Handler

• Message number: 012

• Message text: Extension &1 cannot be created. Name is already in use.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CFD_DE_HANDLER012 - Extension &1 cannot be created. Name is already in use. ?

  The SAP error message CFD_DE_HANDLER012 indicates that there is an attempt to create an extension (such as a custom field or a custom object) in the SAP system, but the name you are trying to use is already in use by another extension or object. This can happen in various contexts, such as when working with the SAP Cloud Application Programming Model (CAP) or when creating custom fields in SAP S/4HANA.
  Cause:
  
  Name Conflict: The most common cause is that the name you are trying to use for the new extension is already assigned to another extension or object in the system.
  Namespace Issues: If you are working in a multi-tenant environment or using a specific namespace, there might be conflicts with names that are not unique within that context.
  Previous Deletion: If an extension was previously deleted but the system has not yet fully cleared the name from its registry, you might encounter this error.
  
  Solution:
  
  
  Check Existing Extensions: 
  
  Use transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to search for existing extensions or objects with the same name.
  You can also use the relevant Fiori apps or transaction codes to list custom fields or extensions.
  
  
  
  Rename the Extension: 
  
  If you find that the name is already in use, consider using a different name for your new extension that is unique and does not conflict with existing objects.
  
  
  
  Delete Unused Extensions: 
  
  If you find an extension that is no longer needed, you can delete it to free up the name. Ensure that you have the necessary authorizations and that the deletion will not affect other functionalities.
  
  
  
  Check for Transport Issues: 
  
  If you are working in a transport environment, ensure that the transport requests are correctly released and that there are no pending changes that might be causing the conflict.
  
  
  
  Consult Documentation: 
  
  Review the SAP documentation or help resources related to the specific area you are working in (e.g., custom fields, extensions) for any additional guidelines or best practices.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search for the error message number in the SAP Support Portal.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  System Logs: Review system logs (transaction SLG1) for any additional error messages or warnings that might provide more context about the issue.
  
  By following these steps, you should be able to resolve the error and successfully create your extension in the SAP system.