How To Fix CNV_MBT_46131 - A definition with the same key already exists

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT_46 - PCL message class

• Message number: 131

• Message text: A definition with the same key already exists

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT_46131 - A definition with the same key already exists ?

  The SAP error message CNV_MBT_46131 indicates that there is an attempt to create or define an entry in the system that already exists, leading to a conflict. This error typically arises during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools.
  Cause:
  
  Duplicate Entries: The most common cause is that the system is trying to create a new entry (like a master data record) that has the same key (e.g., ID, code) as an existing entry in the database.
  Data Mapping Issues: There may be issues in the mapping of data from the source system to the target system, leading to attempts to create duplicate records.
  Configuration Errors: Incorrect configuration settings in the migration tool or the data model can lead to this error.
  
  Solution:
  
  
  Check for Duplicates: 
  
  Review the data being migrated to identify any duplicate entries. You can do this by querying the target database to see if the key already exists.
  If duplicates are found, you may need to clean the source data to remove or consolidate duplicates before migration.
  
  
  
  Adjust Data Mapping:
  
  Ensure that the mapping of fields from the source to the target is correct and does not lead to conflicts.
  Modify the mapping rules if necessary to avoid creating duplicates.
  
  
  
  Review Migration Settings:
  
  Check the configuration settings of the migration tool to ensure that it is set up correctly and that it is not trying to create records that already exist.
  If applicable, adjust the settings to skip existing records or update them instead of trying to create new ones.
  
  
  
  Use Transaction Codes:
  
  If you are familiar with transaction codes, you can use relevant transactions (like SE11 for data dictionary) to check the definitions and existing records in the database.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific migration tool you are using for any additional troubleshooting steps or known issues.
  
  
  
  Log Analysis:
  
  Analyze the logs generated during the migration process to get more context on where the error is occurring and what specific data is causing the conflict.
  
  
  
  Related Information:
  
  SAP Notes: Check for any SAP Notes related to the error message CNV_MBT_46131 for specific guidance or patches that may address the issue.
  Migration Cockpit: Familiarize yourself with the SAP S/4HANA Migration Cockpit documentation, as it provides detailed information on data migration processes and best practices.
  Community Forums: Engage with SAP community forums or support channels where similar issues may have been discussed, providing insights or solutions from other users.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.