How To Fix GG408 - A line already exists with the same contents

SAP Error Message - Details

• Message type: E = Error

• Message class: GG - Messages for FI-SL customizing

• Message number: 408

• Message text: A line already exists with the same contents

What causes this issue?

A line already exists with the same key or the same contents.

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

System Response

How to fix this error?

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GG408 - A line already exists with the same contents ?

  The SAP error message GG408, which states "A line already exists with the same contents," typically occurs in the context of data entry or data processing within SAP, particularly in modules like Financial Accounting (FI) or Controlling (CO). This error indicates that the system has detected a duplicate entry that matches an existing line in the database or in the current transaction.
  Cause:
  
  
  Duplicate Entries: The most common cause is that the user is trying to enter a line item that already exists in the system. This could be due to:
  
  Manual data entry errors.
  Importing data from external sources that contain duplicates.
  Repeating transactions that have not been properly cleared or processed.
  
  
  
  Configuration Issues: Sometimes, the error can arise from configuration settings that enforce unique constraints on certain fields or combinations of fields.
  
  
  Data Migration Issues: If data has been migrated from another system, there may be duplicates that were not identified during the migration process.
  
  
  Solution:
  
  
  Check for Duplicates: Review the entries you are trying to input. Look for existing entries that match the data you are trying to enter. You can do this by:
  
  Searching the relevant transaction or report to see if the line already exists.
  Using transaction codes like SE16 or SE11 to check the underlying database tables.
  
  
  
  Modify the Entry: If you find that the entry already exists, you may need to modify the new entry to ensure it is unique. This could involve changing amounts, dates, or other relevant fields.
  
  
  Clear Existing Entries: If the duplicate entry is not needed, you may consider deleting or clearing the existing entry, provided that it does not affect other processes or reports.
  
  
  Review Configuration: If you suspect that the error is due to configuration settings, consult with your SAP administrator or functional consultant to review the settings related to the specific module you are working in.
  
  
  Data Cleansing: If the issue arises from data migration, perform a data cleansing exercise to identify and remove duplicates from the dataset.
  
  
  Related Information:
  
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that can help you investigate the issue, such as:
  
  FB03: Display Document
  FBL1N: Vendor Line Item Display
  FBL3N: G/L Account Line Item Display
  FBL5N: Customer Line Item Display
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search the SAP Support Portal for specific notes that might address this error.
  
  
  User Training: Ensure that users are trained on data entry best practices to minimize the occurrence of duplicate entries.
  
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your SAP support team or a technical consultant for further assistance.