How To Fix CNV_20100677 - Old account &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: 677

• Message text: Old account &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_20100677 - Old account &1 exists more than once in the mapping for CoA &2 ?

  The SAP error message CNV_20100677 indicates that there is a duplicate entry for an old account in the mapping for a Chart of Accounts (CoA) during a data migration or conversion process. This typically occurs in the context of the SAP Conversion and Migration tools, particularly when using the SAP S/4HANA Migration Cockpit or similar tools.
  Cause:
  The error arises when the system detects that the same old account number (represented by &1) is mapped to more than one new account number in the target Chart of Accounts (represented by &2). This can happen due to:
  
  Duplicate Mapping Entries: The mapping file or table has multiple entries for the same old account.
  Incorrect Data Preparation: During the preparation of the mapping data, the old accounts may have been incorrectly duplicated.
  Data Migration Errors: Errors in the data extraction or transformation process can lead to duplicates.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Review the Mapping Table: Check the mapping table or file where the old accounts are defined. Look for duplicate entries for the old account number mentioned in the error message.
  
  
  Consolidate Duplicate Entries: If you find duplicates, determine which new account should be the correct mapping for the old account. Consolidate the entries so that each old account maps to only one new account.
  
  
  Update the Mapping: After consolidating the entries, update the mapping in the relevant tool or table to ensure that each old account is uniquely mapped to a new account.
  
  
  Re-run the Migration Process: Once the mapping is corrected, re-run the migration or conversion process to see if the error persists.
  
  
  Validation: After the migration, validate the results to ensure that the accounts have been correctly mapped and that there are no further issues.
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like OBY6 (for Chart of Accounts) or OBD2 (for account mapping) to review and edit the mappings.
  Documentation: Refer to SAP documentation on data migration and the specific tools you are using for more detailed guidance on handling mapping issues.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  By following these steps, you should be able to resolve the CNV_20100677 error and successfully complete your data migration or conversion process.