How To Fix CNVMBT260 - Could not insert record into table &1 because entry already existed.

SAP Error Message - Details

• Message type: E = Error

• Message class: CNVMBT - Messages for MBT/API/PCL

• Message number: 260

• Message text: Could not insert record into table &1 because entry already existed.

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 CNVMBT260 - Could not insert record into table &1 because entry already existed. ?

  The SAP error message CNVMBT260 indicates that there was an attempt to insert a record into a database table, but the operation failed because an entry with the same key already exists in that table. This error typically occurs during data migration or data transfer processes, especially when using tools like SAP's Migration Cockpit or other data migration solutions.
  Cause:
  
  Duplicate Data: The most common cause is that the data being imported or migrated contains duplicate entries that violate the unique constraints of the target table.
  Incorrect Mapping: There may be an issue with the mapping of source data to the target structure, leading to attempts to insert records that already exist.
  Data Consistency Issues: The source data may not be clean or consistent, leading to duplicates being present in the dataset.
  Previous Migration Attempts: If a migration process was previously run and not completed successfully, it may have left some records in the target table.
  
  Solution:
  
  Identify Duplicates: Check the source data for duplicates. You can use tools like Excel or SQL queries to identify records that have the same key values.
  Data Cleansing: Clean the source data to remove duplicates or adjust the records to ensure that they are unique before attempting the migration again.
  Check Existing Records: Before inserting new records, check the target table to see if the records already exist. This can be done using SQL queries to query the target table.
  Adjust Mapping: Review the mapping configuration to ensure that it correctly reflects the structure of the source and target data.
  Use Update Instead of Insert: If the intention is to update existing records rather than insert new ones, modify the migration logic to perform updates where records already exist.
  Log and Monitor: Implement logging to capture details of the records that are causing the error, which can help in troubleshooting.
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may want to look into transaction codes like SE11 (Data Dictionary) to check the structure of the table, or SE16 (Data Browser) to view existing records.
  Migration Tools: Familiarize yourself with the specific migration tool being used (e.g., SAP S/4HANA Migration Cockpit, LSMW) and its documentation for best practices on handling duplicates.
  SAP Notes: Check SAP Notes for any known issues or patches related to the error message CNVMBT260, as there may be specific recommendations or fixes provided by SAP.
  
  By following these steps, you should be able to resolve the CNVMBT260 error and successfully complete your data migration or transfer process.