How To Fix CNV_MBT_DEX230 - Duplicate key while updating control tables

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT_DEX - DMIS Data Extract related messages

• Message number: 230

• Message text: Duplicate key while updating control tables

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT_DEX230 - Duplicate key while updating control tables ?

  The SAP error message CNV_MBT_DEX230: Duplicate key while updating control tables typically occurs during data migration or conversion processes, particularly when using SAP's Migration Cockpit or similar tools. This error indicates that there is an attempt to insert or update a record in a control table where a unique key constraint is violated due to the presence of duplicate entries.
  Causes:
  
  Duplicate Data: The most common cause is that the source data being migrated contains duplicate entries that violate the unique constraints of the target control tables.
  Incorrect Mapping: There may be issues with the mapping of fields from the source to the target, leading to unintended duplicates.
  Data Preparation Issues: If the data was not properly cleaned or transformed before migration, it could lead to duplicates.
  Concurrency Issues: If multiple processes are trying to update the same control table simultaneously, it could lead to conflicts.
  
  Solutions:
  
  
  Identify Duplicates: 
  
  Review the source data to identify any duplicate records. You can use SQL queries or data profiling tools to find duplicates based on the unique key fields.
  
  
  
  Data Cleansing:
  
  Clean the source data to remove duplicates before attempting the migration again. This may involve consolidating records or deciding which duplicates to keep.
  
  
  
  Check Mapping Configuration:
  
  Review the mapping configuration in the migration tool to ensure that it is set up correctly and that it does not inadvertently create duplicates.
  
  
  
  Adjust Control Table Constraints:
  
  If appropriate, consider adjusting the constraints on the control tables temporarily to allow for the migration, but be cautious with this approach as it may lead to data integrity issues.
  
  
  
  Log Analysis:
  
  Check the logs generated during the migration process for more detailed error messages that can provide insights into which records are causing the issue.
  
  
  
  Batch Processing:
  
  If the migration is being done in batches, consider reducing the batch size to isolate the problematic records more easily.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific migration tool you are using for any known issues or additional troubleshooting steps.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide guidance on best practices for data migration.
  Migration Cockpit: Familiarize yourself with the features and limitations of the SAP Migration Cockpit, as it may have specific settings or configurations that can help prevent this error.
  Data Quality Tools: Consider using data quality tools to assess and improve the quality of your source data before migration.
  
  By following these steps, you should be able to identify the root cause of the CNV_MBT_DEX230 error and implement a solution to resolve it.