How To Fix CNV_MBT_SHELL026 - This record already exists in the database

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_MBT_SHELL - Shell Creation

• Message number: 026

• Message text: This record already exists in the database

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_MBT_SHELL026 - This record already exists in the database ?

  The SAP error message CNV_MBT_SHELL026 indicates that there is an attempt to insert a record into the database that already exists. This error typically occurs during data migration or data transfer processes, particularly when using SAP's Migration Cockpit or other data migration tools.
  Cause:
  
  Duplicate Records: The most common cause is that the data being imported contains duplicate entries that violate the unique constraints of the database table.
  Incorrect Mapping: The mapping of fields during the migration process may not be set up correctly, leading to attempts to insert records that already exist.
  Data Preparation Issues: The source data may not have been cleaned or deduplicated properly before the migration process.
  Transaction Conflicts: If multiple processes are trying to insert the same record simultaneously, it can lead to this error.
  
  Solution:
  
  Identify Duplicates: Check the source data for duplicates. You can use tools like Excel or SQL queries to identify and remove duplicate records before migration.
  Review Mapping: Ensure that the mapping of fields in the migration tool is correct and that it aligns with the target database structure.
  Use Upsert Logic: If applicable, modify the migration process to use an "upsert" (update or insert) logic, which will update existing records instead of trying to insert them again.
  Check Constraints: Review the database constraints to understand which fields are causing the uniqueness violation and ensure that the data being migrated adheres to these constraints.
  Log and Analyze: Enable detailed logging in the migration tool to capture more information about the records causing the error. This can help in diagnosing the issue.
  Manual Intervention: If necessary, manually check the records in the target database to understand why the conflict is occurring and resolve it accordingly.
  
  Related Information:
  
  Transaction Logs: Review transaction logs to see the exact records that are causing the conflict.
  SAP Notes: Check SAP Notes for any known issues or patches related to the migration tool you are using.
  Documentation: Refer to the official SAP documentation for the specific migration tool or process you are using for additional troubleshooting steps and best practices.
  Support: If the issue persists, consider reaching out to SAP support for assistance, providing them with detailed logs and information about the migration process.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.