How To Fix CNV_DMC_SIN343 - Legacy contract number &1 already exists in company code &2

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_SIN - Messages for s-innovations migration

• Message number: 343

• Message text: Legacy contract number &1 already exists in company code &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_SIN343 - Legacy contract number &1 already exists in company code &2 ?

  The SAP error message CNV_DMC_SIN343 indicates that there is a conflict with a legacy contract number that already exists in the specified company code. This error typically arises during data migration or conversion processes, particularly when using the SAP Data Migration Cockpit or similar tools.
  Cause:
  The error occurs because:
  
  The legacy contract number you are trying to import or create already exists in the target company code.
  There may be duplicate entries in the source data that are being migrated.
  The data migration process is not correctly handling existing records, leading to conflicts.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Existing Records:
  
  Verify if the legacy contract number already exists in the target company code. You can do this by querying the relevant tables (e.g., contract tables) in SAP.
  
  
  
  Data Cleansing:
  
  Review the source data for duplicates. Ensure that the legacy contract numbers are unique before attempting the migration again.
  If duplicates are found, decide whether to merge them, delete them, or adjust the contract numbers.
  
  
  
  Adjust Migration Logic:
  
  If the legacy contract numbers must be preserved, consider modifying the migration logic to handle existing records appropriately. This may involve updating existing records instead of trying to create new ones.
  
  
  
  Use a Different Contract Number:
  
  If possible, use a different legacy contract number for the new entries that do not conflict with existing ones.
  
  
  
  Consult Documentation:
  
  Review the SAP documentation related to the data migration process you are using. There may be specific guidelines or best practices for handling legacy data.
  
  
  
  Error Logs:
  
  Check the error logs for more detailed information about the migration process. This can provide insights into what went wrong and how to fix it.
  
  
  
  Testing:
  
  Before running the migration in the production environment, conduct tests in a development or quality assurance environment to ensure that the changes resolve the issue without introducing new problems.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SE16 (Data Browser) to check existing records, and SCU3 (Change Document Overview) to see changes made to contracts.
  SAP Notes: Look for SAP Notes related to data migration and the specific error message for any patches or updates that may address the issue.
  Data Migration Tools: If you are using specific tools for data migration (like SAP S/4HANA Migration Cockpit), refer to their documentation for best practices and troubleshooting tips.
  
  By following these steps, you should be able to resolve the CNV_DMC_SIN343 error and successfully complete your data migration process.