How To Fix G0398 - A data row with the same key has already been imported

SAP Error Message - Details

• Message type: E = Error

• Message class: G0 - Messages for SAP Consolidation

• Message number: 398

• Message text: A data row with the same key has already been imported

What causes this issue?

The current data row contains the same values in its key fields as a
data row that was already imported. Each data row in the database must
have at least one key field that differs from the key fields of other
rows.

System Response

The data rows cannot be copied.

How to fix this error?

Ensure that the data rows in file &V1& are differentiated by at least
one key field.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message G0398 - A data row with the same key has already been imported ?

  The SAP error message G0398, which states "A data row with the same key has already been imported," typically occurs during data import processes, such as when using tools like LSMW (Legacy System Migration Workbench) or data uploads via BAPIs or IDocs. This error indicates that the system has detected a duplicate entry based on a unique key defined in the data structure.
  Cause:
  
  
  Duplicate Data: The most common cause is that the data being imported contains duplicate entries for a key field that must be unique. This could be due to:
  
  Errors in the source data file.
  Multiple records in the source data that share the same key.
  Previous import attempts that have already created records in the target system.
  
  
  
  Key Definition: The key fields that are defined in the target table or structure may not allow duplicates, leading to this error when an attempt is made to insert a duplicate record.
  
  
  Solution:
  
  
  Check Source Data: Review the data file or source from which you are importing. Look for duplicate entries based on the key fields. You can use tools like Excel or database queries to identify duplicates.
  
  
  Remove Duplicates: If duplicates are found, you can either:
  
  Remove the duplicate entries from the source data.
  Modify the data to ensure that each entry is unique.
  
  
  
  Adjust Import Logic: If the duplicates are valid and should be handled differently, consider adjusting the import logic:
  
  Use an update operation instead of an insert if the records already exist.
  Implement logic to skip duplicates during the import process.
  
  
  
  Check Previous Imports: If the data was previously imported, verify if the records already exist in the target system. If they do, you may need to decide whether to update them or skip them in the current import.
  
  
  Error Handling: Implement error handling in your import process to log or report duplicates instead of failing the entire import.
  
  
  Related Information:
  
  Key Fields: Understand the key fields defined in the target table. You can usually find this information in the data dictionary (SE11) or by checking the table structure.
  Transaction Codes: Familiarize yourself with relevant transaction codes like LSMW, BAPIs, or IDocs that you are using for the import.
  SAP Notes: Check SAP Notes for any known issues or additional guidance related to the specific import method you are using.
  Testing: Always test your import with a small subset of data to ensure that the process works as expected before performing a full import.
  
  By following these steps, you should be able to resolve the G0398 error and successfully import your data into SAP.