How To Fix CNV_00001254 - Source table &1 equals target table &2. Self mapping is not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_00001 - Message class for CWB settings maintenance programs

• Message number: 254

• Message text: Source table &1 equals target table &2. Self mapping is not supported

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_00001254 - Source table &1 equals target table &2. Self mapping is not supported ?

  The SAP error message CNV_00001254 indicates that there is an issue with data mapping during a data migration or conversion process. Specifically, it suggests that the source table and the target table are the same, which means that the system is trying to map data from a table to itself. This is not supported in the context of the migration or conversion process.
  Cause:
  The primary cause of this error is that the data migration or conversion process is attempting to map a source table to the same table as the target. This can happen due to:
  
  Configuration Error: The mapping configuration may have been set incorrectly, leading to the same table being specified for both source and target.
  Data Migration Logic: The logic defined for the data migration might not be correctly distinguishing between source and target tables.
  Duplicate Entries: There may be an attempt to process data that is already present in the target table without any transformation or change.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Mapping Configuration: Review the mapping configuration in the data migration tool or program you are using. Ensure that the source and target tables are correctly defined and that they are not the same.
  
  
  Modify the Migration Logic: If you are using a custom program or logic for data migration, ensure that the logic correctly differentiates between source and target tables. You may need to adjust the code to ensure that it does not attempt to map a table to itself.
  
  
  Use Different Tables: If the intention is to transform or copy data, consider using a different target table or a staging table where the data can be processed before being moved to the final target table.
  
  
  Consult Documentation: Refer to the SAP documentation related to the specific data migration tool or process you are using. There may be specific guidelines or best practices for handling table mappings.
  
  
  Testing: After making the necessary changes, perform a test run of the migration process to ensure that the error does not occur again.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this error message.
  Data Migration Tools: Familiarize yourself with the specific data migration tools you are using (e.g., SAP S/4HANA Migration Cockpit, SAP Data Services) as they may have specific requirements or configurations.
  Community Forums: Consider searching or posting in SAP community forums or support channels for additional help from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.