How To Fix CNV_2010C028 - 'Mapped ID' already exists in G/L account master data

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_2010C - Message class for CoA on Cloud

• Message number: 028

• Message text: 'Mapped ID' already exists in G/L account master data

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_2010C028 - 'Mapped ID' already exists in G/L account master data ?

  The SAP error message CNV_2010C028, which states that a 'Mapped ID' already exists in G/L account master data, typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that there is a conflict with the mapping of General Ledger (G/L) accounts, where the system has detected that the ID you are trying to map already exists in the G/L account master data.
  Cause:
  
  Duplicate Mapping: The most common cause of this error is that the ID you are trying to map to an existing G/L account is already in use. This can happen if the mapping file contains duplicate entries or if the same ID is being used for multiple accounts.
  Incorrect Mapping Configuration: There may be an issue with how the mapping is configured, leading to conflicts with existing G/L accounts.
  Data Migration Issues: If you are migrating data from another system, there may be overlaps in the account IDs being used.
  
  Solution:
  
  Check for Duplicates: Review the mapping file or the data you are trying to import to ensure that there are no duplicate entries for the 'Mapped ID'. Each ID should be unique.
  Verify Existing G/L Accounts: Check the existing G/L account master data in your SAP system to see if the 'Mapped ID' already exists. If it does, you may need to either:
  
  Change the ID in your mapping file to a unique one.
  Update the existing G/L account if it is appropriate to do so.
  
  
  Adjust Mapping Configuration: If the mapping configuration is incorrect, adjust it to ensure that it aligns with the existing G/L accounts and does not create conflicts.
  Consult Documentation: Refer to the SAP documentation for the specific migration tool you are using to ensure that you are following the correct procedures and guidelines.
  Testing: After making changes, perform a test migration with a smaller dataset to ensure that the issue is resolved before proceeding with the full migration.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions for this specific error message.
  Migration Cockpit: Familiarize yourself with the SAP S/4HANA Migration Cockpit and its functionalities, as it provides tools for mapping and migrating data effectively.
  Data Validation: Implement data validation checks before migration to catch potential issues early in the process.
  
  If the problem persists after trying the above solutions, consider reaching out to SAP support or consulting with an SAP expert who can provide more tailored assistance based on your specific system configuration and data migration scenario.