How To Fix CNV_DMC_SIN339 - Update or enhance of already existing record &1 is not allowed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 339

• Message text: Update or enhance of already existing record &1 is not allowed

What causes this issue?

You transferred a value in one of the fields provided on sheet 'General
Data', but the supplier master &V1& already exists.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

It is not allowed to change or enhance an already existing record in the
related supplier master: Therefor you can use the Mass Maintenance App.
For further information, refer to online documentation of the Mass
Maintenance App.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_SIN339 - Update or enhance of already existing record &1 is not allowed ?

  The SAP error message CNV_DMC_SIN339 typically occurs during data migration processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that there is an attempt to update or enhance an already existing record in a way that is not permitted by the system.
  Cause:
  
  Duplicate Records: The error often arises when there is an attempt to insert or update a record that already exists in the target system. This can happen if the data being migrated contains duplicates or if the migration logic is incorrectly configured.
  Key Violations: The record being processed may have a unique key constraint that is violated by the incoming data.
  Data Integrity Rules: The system may have specific rules or validations that prevent certain updates to existing records, especially if they are linked to other data or processes.
  Incorrect Mapping: The mapping of fields between the source and target systems may not be correctly defined, leading to attempts to overwrite existing data inappropriately.
  
  Solution:
  
  Check for Duplicates: Review the source data for duplicates that may be causing the issue. Ensure that each record is unique and does not conflict with existing records in the target system.
  Review Data Mapping: Ensure that the mapping of fields between the source and target systems is correctly defined. Make sure that the fields being updated are intended to be updated and that the logic aligns with the business requirements.
  Adjust Migration Logic: If the migration process is designed to update existing records, ensure that the logic allows for this and that it adheres to the constraints of the target system.
  Use the Correct Migration Mode: If you are trying to insert new records, ensure that you are using the correct mode (e.g., "Insert" instead of "Update") in the migration tool.
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit or the specific migration tool you are using to understand the constraints and requirements for updating records.
  Error Logs: Check the error logs for more detailed information about the specific record causing the issue. This can help identify the exact nature of the conflict.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on data migration issues.
  Data Migration Cockpit Documentation: Review the official SAP documentation for the Data Migration Cockpit for best practices and troubleshooting tips.
  Community Forums: Engage with the SAP Community or forums where other users may have encountered similar issues and can provide insights or solutions.
  
  By following these steps, you should be able to identify the root cause of the CNV_DMC_SIN339 error and implement a suitable solution to resolve it.