How To Fix KF102 - Document &/& already exists (Line item not created)

SAP Error Message - Details

• Message type: E = Error

• Message class: KF -

• Message number: 102

• Message text: Document &/& already exists (Line item not created)

What causes this issue?

There is already a line item with the same key in the data base.

System Response

The line item has not been posted. Your data has not been deleted.

How to fix this error?

Check if the line item has already been posted. If not, enter another
document number and post again.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message KF102 - Document &/& already exists (Line item not created) ?

  The SAP error message KF102 ("Document &/& already exists (Line item not created)") typically occurs in the context of financial postings or document entries in SAP. This error indicates that the system has detected a duplicate document entry, which prevents the creation of a new line item.
  Cause:
  
  
  Duplicate Document Number: The most common cause of this error is that the document number you are trying to post already exists in the system. This can happen if:
  
  The document was already posted.
  There is a manual entry of the same document number.
  The document number is being generated automatically, and the same number is being reused.
  
  
  
  Document Type Configuration: The document type associated with the transaction may have settings that restrict the reuse of document numbers.
  
  
  Posting Period Issues: If the posting period is closed or if there are restrictions on posting in certain periods, it may lead to this error.
  
  
  Solution:
  
  
  Check Existing Documents: 
  
  Use transaction codes like FB03 (Display Document) to check if the document number already exists in the system.
  If it does, verify if the document is valid and if any corrections or adjustments are needed.
  
  
  
  Change Document Number: 
  
  If you are manually entering the document number, try using a different number that does not already exist in the system.
  
  
  
  Review Document Type Settings: 
  
  Check the configuration of the document type in transaction OBY6 or OBA7 to ensure that it allows for the creation of new documents without conflicts.
  
  
  
  Check Posting Period: 
  
  Ensure that the posting period is open. You can check this in transaction OB52 to see if the period is open for the relevant company code and transaction type.
  
  
  
  Consult with SAP Basis or Functional Team: 
  
  If the issue persists, it may be necessary to consult with your SAP Basis or functional team to investigate further, especially if there are customizations or specific configurations in your SAP environment.
  
  
  
  Related Information:
  
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as:
  
  FB03: Display Document
  FB01: Post Document
  OB52: Open and Close Posting Periods
  OBY6: Document Type Configuration
  OBA7: Document Number Ranges
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search for notes in the SAP Support Portal.
  
  
  Documentation: Review SAP documentation or help files related to document posting and error handling for additional insights.
  
  
  By following these steps, you should be able to identify the cause of the KF102 error and implement a solution to resolve it.