How To Fix DMC_RT_MSG013 - Data already exists in table &1 (check entries)

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 013

• Message text: Data already exists in table &1 (check entries)

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 DMC_RT_MSG013 - Data already exists in table &1 (check entries) ?

  The SAP error message DMC_RT_MSG013 indicates that there is an attempt to insert or update data in a table where the data already exists. This typically occurs in scenarios involving data migration, data replication, or data transformation processes, particularly when using tools like SAP Data Migration Cockpit (DMC) or SAP Data Services.
  Cause:
  
  
  Duplicate Entries: The most common cause is that the data you are trying to insert already exists in the target table. This could be due to:
  
  Previous data migration processes that have already inserted the same records.
  Data being processed multiple times due to configuration issues or incorrect mappings.
  Manual entries in the target table that conflict with the incoming data.
  
  
  
  Primary Key Violations: If the table has a primary key or unique constraint, attempting to insert a record with a key that already exists will trigger this error.
  
  
  Incorrect Data Mapping: If the data mapping is not set up correctly, it may lead to attempts to insert duplicate records.
  
  
  Solution:
  
  
  Check Existing Data: Before running the migration or data load process, check the target table for existing records that may conflict with the incoming data. You can do this by querying the table with the relevant keys.
  
  
  Adjust Data Load Logic: Modify the data load process to handle duplicates appropriately. This could involve:
  
  Using an "upsert" (update or insert) approach where existing records are updated instead of inserted.
  Filtering out records that already exist in the target table before attempting to load new data.
  
  
  
  Data Cleansing: Ensure that the source data is cleansed and does not contain duplicates before the migration process. This may involve deduplication processes in the source system.
  
  
  Review Data Mapping: Ensure that the data mapping in your migration tool is correctly configured to avoid conflicts.
  
  
  Error Handling: Implement error handling in your data migration process to log and manage errors effectively, allowing for easier troubleshooting.
  
  
  Related Information:
  
  Transaction Codes: Depending on the context, you may want to check transaction codes like SE11 (Data Dictionary) to view the table structure and constraints, or SE16 (Data Browser) to view the data in the table.
  SAP Notes: Check SAP Notes for any known issues or updates related to the specific error message or the tools you are using.
  Documentation: Review the documentation for the data migration tool you are using (e.g., SAP Data Migration Cockpit) for best practices and guidelines on handling data loads.
  
  By following these steps, you should be able to resolve the DMC_RT_MSG013 error and successfully manage your data migration or replication tasks.