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

FKKINV644 - Overview

• 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

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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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