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

G0398 - Overview

• 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.

G0398 - Details

• 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