How To Fix FKKINV128 - Contract account &1 invoiced with document number &2

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 128

• Message text: Contract account &1 invoiced with document number &2

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message FKKINV128 - Contract account &1 invoiced with document number &2 ?

  The SAP error message FKKINV128 indicates that a contract account has already been invoiced with a specific document number. This error typically arises in the context of billing and invoicing processes within the SAP Convergent Charging or Contract Accounts Receivable and Payable (FI-CA) modules.
  Cause:
  The error occurs when there is an attempt to invoice a contract account that has already been processed with a specific invoice document. This can happen due to:
  
  Duplicate invoicing attempts for the same contract account and document number.
  Incorrect configuration or logic in the billing process that allows for multiple invoicing of the same account.
  Manual errors where users attempt to re-invoice an account that has already been settled.
  
  Solution:
  To resolve the FKKINV128 error, consider the following steps:
  
  
  Check Invoice History: Review the invoice history for the contract account in question to confirm that the account has indeed been invoiced with the specified document number.
  
  
  Avoid Duplicate Invoicing: Ensure that the process or logic used to generate invoices does not allow for duplicates. This may involve checking the configuration settings in the billing process.
  
  
  Correct Document Number: If the intention was to create a new invoice, verify that the correct document number is being used and that it does not match an existing invoice for that account.
  
  
  Consult Documentation: Review SAP documentation or notes related to the FKKINV128 error for any specific guidance or updates that may apply to your version of SAP.
  
  
  Contact Support: If the issue persists and you cannot identify the cause, consider reaching out to SAP support or your internal SAP team for further assistance. They may be able to provide insights based on system logs or configurations.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FBL5N (Customer Line Item Display) or FB03 (Display Document) to investigate the invoicing history.
  SAP Notes: Check for any SAP Notes that may address this specific error or provide patches that could resolve underlying issues.
  Configuration Settings: Review the configuration settings in the FI-CA module related to billing and invoicing to ensure they are set up correctly.
  
  By following these steps, you should be able to identify the cause of the FKKINV128 error and implement a solution to prevent it from occurring in the future.