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