How To Fix CNV_20100679 - Old cost element &1 exists more than once in the mapping for CoA &2

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_20100 - Messageclass for chart of account conversion

• Message number: 679

• Message text: Old cost element &1 exists more than once in the mapping for CoA &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_20100679 - Old cost element &1 exists more than once in the mapping for CoA &2 ?

  The SAP error message CNV_20100679 indicates that there is a duplicate entry for an old cost element in the mapping for a Chart of Accounts (CoA) during a migration or conversion process. This typically occurs in the context of data migration projects, especially when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  The error arises when the system detects that the same old cost element (identified by &1) is mapped more than once in the mapping table for the specified Chart of Accounts (identified by &2). This can happen due to:
  
  Duplicate Entries: The mapping table may have been populated with duplicate entries for the same cost element.
  Incorrect Data Preparation: During the data preparation phase, the mapping file may have been incorrectly created or modified, leading to duplicates.
  Data Migration Tool Issues: There may be issues with the data migration tool or process that led to the duplication of entries.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Review the Mapping Table: Check the mapping table for the Chart of Accounts to identify where the duplicate entries for the old cost element exist. You can do this by:
  
  Accessing the mapping table in the relevant transaction (e.g., transaction code CNV_MBT).
  Filtering or sorting the entries to find duplicates.
  
  
  
  Remove Duplicates: Once you identify the duplicates, you need to decide which entry to keep and remove the others. Ensure that the remaining entry is correct and valid for the migration.
  
  
  Validate the Mapping: After removing duplicates, validate the mapping to ensure that all necessary cost elements are correctly mapped and that there are no further duplicates.
  
  
  Re-run the Migration Process: After making the necessary corrections, re-run the migration process to see if the error persists.
  
  
  Consult Documentation: If you are unsure about the mapping or the process, refer to the SAP documentation or guides related to the specific migration tool you are using.
  
  
  Related Information:
  
  Migration Cockpit: If you are using the SAP S/4HANA Migration Cockpit, familiarize yourself with its functionalities and best practices for data mapping.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling mapping issues.
  Testing: Always perform thorough testing in a development or sandbox environment before executing changes in production to avoid data inconsistencies.
  
  By following these steps, you should be able to resolve the CNV_20100679 error and successfully complete your migration process.