How To Fix CNV_DMC_SIN404 - 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: 404

• 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 customer 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 customer master. You can use the Mass Maintenance APP for this.
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_SIN404 - Update or enhance of already existing record &1 is not allowed ?

  The SAP error message CNV_DMC_SIN404 indicates that there is an attempt to update or enhance an already existing record in a way that is not permitted. This error typically arises in the context of data migration or data conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools.
  Cause:
  
  Record Already Exists: The error occurs when the system detects that the record you are trying to update already exists in the target database, and the operation you are attempting is not allowed for existing records.
  Data Migration Rules: There may be specific rules or constraints defined in the data migration process that prevent updates to existing records.
  Key Violations: The operation may violate primary key or unique constraints in the target table.
  Incorrect Mapping: The mapping of fields between the source and target systems may not be correctly defined, leading to conflicts.
  
  Solution:
  
  Check Existing Records: Before attempting to update or enhance records, check if the record already exists in the target system. If it does, you may need to decide whether to update it or skip the operation.
  Review Migration Rules: Review the data migration rules and configurations to ensure that updates to existing records are allowed if that is your intention.
  Use the Correct Operation: If you need to update an existing record, ensure you are using the correct operation (e.g., update instead of create) and that the necessary permissions are in place.
  Adjust Data Mapping: Ensure that the data mapping between the source and target systems is correctly defined to avoid conflicts.
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit or the specific migration tool you are using for guidance on handling existing records.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context.
  Transaction Codes: Familiarize yourself with transaction codes related to data migration, such as LTMC (for the Migration Cockpit) or LTMOM (for the Migration Object Modeler).
  Logs and Traces: Review logs and traces generated during the migration process to identify the exact cause of the error and gather more context.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to diagnose and resolve the CNV_DMC_SIN404 error effectively.