How To Fix G0399 - A data row already exists with the same key

SAP Error Message - Details

• Message type: E = Error

• Message class: G0 - Messages for SAP Consolidation

• Message number: 399

• Message text: A data row already exists with the same key

What causes this issue?

The key fields of the current data row contain values identical to
those in the key fields of a data row already in the database.

System Response

The original database entry will be overwritten by the contents of the
imported data row.

How to fix this error?

If you do not want the original database entry to be overwritten,
delete the data row with the identical key from file &V1& before
importing in update mode.

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 G0399 - A data row already exists with the same key ?

  The SAP error message G0399, which states "A data row already exists with the same key," typically occurs when there is an attempt to insert or update a record in a database table where a unique constraint is violated. This means that the system is trying to create a new entry that has the same key (or unique identifier) as an existing entry in the database.
  Causes:
  
  
  Duplicate Key Entry: The most common cause is that the data being entered has a key that already exists in the database. This could be due to:
  
  Manual data entry errors.
  Data import processes that do not check for existing records.
  Incorrect logic in custom programs or reports that generate new records.
  
  
  
  Data Migration Issues: During data migration or system upgrades, if the data is not properly cleaned or transformed, it can lead to duplicates.
  
  
  Concurrency Issues: If multiple users or processes are trying to insert the same record simultaneously, it can lead to this error.
  
  
  Incorrect Configuration: Sometimes, the configuration of the system or the database may not be set up correctly, leading to unexpected behavior.
  
  
  Solutions:
  
  
  Check for Existing Records: Before inserting or updating a record, check if a record with the same key already exists in the database. This can be done through a simple SELECT query.
  
  
  Modify Data Entry Logic: If the error occurs during data entry, ensure that the application logic checks for existing records before attempting to create a new one.
  
  
  Data Cleansing: If the error arises from data migration, review the data for duplicates and clean it up before importing it into the system.
  
  
  Error Handling: Implement error handling in your custom programs to catch this error and provide a meaningful message to the user, guiding them on how to resolve the issue.
  
  
  Database Constraints: Review the database constraints and ensure they are correctly defined. If necessary, adjust the constraints to allow for the intended data structure.
  
  
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or patches that may address this specific error.
  
  
  Related Information:
  
  Transaction Codes: Depending on where the error occurs, you may want to look into transaction codes like SE11 (Data Dictionary), SE80 (Object Navigator), or SE37 (Function Module) to analyze the data structure and logic.
  Debugging: If the error is coming from a custom program, consider debugging the program to identify where the duplicate key is being generated.
  SAP Community: Engaging with the SAP Community forums can provide insights from other users who may have encountered and resolved similar issues.
  
  By following these steps, you should be able to identify the cause of the G0399 error and implement a solution to prevent it from occurring in the future.