How To Fix FKKINV661 - Invoicing category for invoicing unit is not unique

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 661

• Message text: Invoicing category for invoicing unit is not unique

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 FKKINV661 - Invoicing category for invoicing unit is not unique ?

  The SAP error message FKKINV661 indicates that there is an issue with the invoicing category for an invoicing unit not being unique. This typically occurs in the context of contract accounts receivable and payable (FI-CA) when the system is trying to process an invoice but finds multiple entries that match the criteria for the invoicing unit.
  Cause:
  The error is usually caused by one of the following reasons:
  
  Duplicate Entries: There are multiple invoicing categories assigned to the same invoicing unit, which leads to ambiguity in processing the invoice.
  Configuration Issues: The configuration settings in the system may not be set up correctly, leading to non-unique invoicing categories for the invoicing unit.
  Data Integrity Issues: There may be inconsistencies or errors in the master data related to the invoicing units or categories.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Invoicing Units:
  
  Go to the relevant transaction in SAP (e.g., transaction code FP03 or FPL9) to review the invoicing units and their associated categories.
  Ensure that each invoicing unit has a unique invoicing category assigned.
  
  
  
  Review Configuration:
  
  Check the configuration settings in the SAP system for invoicing categories and units. This can typically be done in the SPRO transaction under the FI-CA settings.
  Ensure that the settings are correctly defined to avoid overlaps or duplicates.
  
  
  
  Data Cleanup:
  
  If duplicates are found, you may need to clean up the data by removing or correcting the duplicate entries.
  Use transaction codes like SE16 or SE11 to access the relevant tables and identify duplicates.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or notes related to the error message FKKINV661 for any specific guidance or patches that may address the issue.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance. They may provide insights based on the specific configuration and version of your SAP system.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FP03 (Display Invoice), FPL9 (Display Document), and SE16 (Data Browser) for data inspection.
  SAP Notes: Search for SAP Notes related to FKKINV661 in the SAP Support Portal for any known issues or fixes.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, providing additional insights or solutions.
  
  By following these steps, you should be able to identify and resolve the cause of the FKKINV661 error in your SAP system.