How To Fix FKKINV644 - Preliminary invoice &1 was already processed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 644

• Message text: Preliminary invoice &1 was already processed

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FKKINV644 - Preliminary invoice &1 was already processed ?

  The SAP error message FKKINV644 indicates that a preliminary invoice (also known as a pro forma invoice) has already been processed in the system. This error typically occurs in the context of the SAP Contract Accounts Receivable and Payable (FI-CA) module when attempting to process a preliminary invoice that has already been finalized or posted.
  Cause:
  
  Duplicate Processing: The most common cause of this error is an attempt to process the same preliminary invoice more than once. This can happen if the user tries to post the invoice again after it has already been processed.
  System Configuration: There may be specific configurations or settings in the system that prevent the reprocessing of preliminary invoices.
  User Error: Users may inadvertently try to reprocess an invoice without realizing it has already been handled.
  
  Solution:
  
  Check Invoice Status: Verify the status of the preliminary invoice in the system. You can do this by checking the invoice document number in the relevant transaction (e.g., FBL5N for customer line items).
  Avoid Duplicate Processing: Ensure that you are not attempting to process the same invoice multiple times. If the invoice has already been processed, you may need to look for the corresponding final invoice or document.
  Review Logs: Check the application logs or error logs for more details on the processing of the invoice. This can provide insights into what actions were taken and why the error occurred.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling preliminary invoices in your version of SAP.
  Contact Support: If the issue persists and you cannot determine the cause, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FBL5N (Customer Line Items), FKKINV (Invoice Processing), and others that may help in managing invoices.
  SAP Notes: Check for any SAP Notes related to this error message, as they may provide additional context or solutions.
  User Training: Ensure that users are trained on the proper procedures for handling preliminary invoices to minimize the risk of errors.
  
  By following these steps, you should be able to resolve the FKKINV644 error and understand the underlying issues related to preliminary invoice processing in SAP.