How To Fix FKKINV120 - Billing document &1 (source document category &2) already invoiced

SAP Error Message - Details

• Message type: E = Error

• Message class: FKKINV - Invoicing in Contract Accounts Receivable and Payable

• Message number: 120

• Message text: Billing document &1 (source document category &2) already invoiced

trados = fi

What causes this issue?

The source document specified is to be invoiced. According to the
invoicing history, this document has already been invoiced with
invoicing document number &V3&.

System Response

Processing cannot be continued.
This is a possibly a data inconsistency. There may only be an invoicing
order for a source document if this document is not included in any
unreversed invoicing.

How to fix this error?

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

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FKKINV120 - Billing document &1 (source document category &2) already invoiced ?

  The SAP error message FKKINV120 indicates that a billing document has already been invoiced, which means that the system has detected an attempt to invoice a document that has already been processed. This error typically occurs in the context of contract accounts receivable and payable (FI-CA) when trying to create a new invoice for a document that has already been invoiced.
  Cause:
  
  Duplicate Invoicing Attempt: The most common cause is that there is an attempt to create an invoice for a billing document that has already been invoiced.
  Incorrect Document Flow: There may be an issue with the document flow where the system does not recognize that the document has already been processed.
  Manual Entry Errors: Users may inadvertently try to invoice the same document multiple times due to manual errors or misunderstanding of the process.
  
  Solution:
  
  Check Document Status: Verify the status of the billing document in question. You can do this by checking the document flow in the relevant transaction (e.g., using transaction code FBL5N for customer line items).
  Review Invoicing History: Look at the invoicing history to confirm whether the document has indeed been invoiced. If it has, you will need to determine if a new invoice is necessary or if adjustments can be made to the existing invoice.
  Correct Document Flow: If there is an issue with the document flow, you may need to correct it. This could involve reversing an incorrect invoice or adjusting the related documents.
  Consult with SAP Support: If you are unable to resolve the issue, consider reaching out to your SAP support team or consulting SAP Notes for any known issues or patches related to this error.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FBL5N (Customer Line Items), FKKINV (Billing Document), and FKKOP (Display Document).
  SAP Notes: Check SAP Notes for any specific fixes or updates related to this error message. You can search for FKKINV120 in the SAP Support Portal.
  Documentation: Review SAP documentation related to billing and invoicing processes in FI-CA to ensure compliance with best practices.
  
  By following these steps, you should be able to identify the cause of the error and take appropriate action to resolve it.