How To Fix FKKINV646 - Error during determination of official document number

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 646

• Message text: Error during determination of official document number

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FKKINV646 - Error during determination of official document number ?

  The SAP error message FKKINV646, which states "Error during determination of official document number," typically occurs in the context of billing or invoicing processes within the SAP system, particularly in the area of contract accounts receivable and payable (FI-CA). This error indicates that the system encountered an issue while trying to determine the official document number that is required for the transaction.
  Causes:
  
  Configuration Issues: The official document number may not be properly configured in the system. This could be due to missing or incorrect settings in the document type or number range configuration.
  Missing Number Ranges: The number range for the official document may not be defined or may have been exhausted.
  Authorization Issues: The user may not have the necessary authorizations to access or create the official document number.
  Data Inconsistencies: There may be inconsistencies in the data that prevent the system from determining the official document number.
  Custom Code: If there are custom developments or enhancements in the system, they may interfere with the standard process of determining the official document number.
  
  Solutions:
  
  Check Configuration: Review the configuration settings for the official document number in the relevant customizing transactions (e.g., OBA7 for document types, OBA8 for number ranges). Ensure that the number ranges are correctly defined and active.
  Number Range Maintenance: Go to transaction SNRO (Number Range Objects) and check the number range object related to the official document. Ensure that there are available numbers in the range.
  User Authorizations: Verify that the user has the necessary authorizations to create or access the official document number. This can be checked in transaction SU53 or by consulting with your security team.
  Data Consistency Check: Run consistency checks for the relevant data in the system. This may involve checking for any missing or incorrect entries in the database tables related to billing or invoicing.
  Debugging: If the issue persists, consider debugging the process to identify where the error occurs. This may require the assistance of a developer or SAP support.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message. There may be patches or updates that resolve known issues.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FBL5N (Customer Line Item Display), F-28 (Post Incoming Payments), and others related to billing and invoicing.
  Documentation: Review SAP documentation related to FI-CA and official document management for further insights into configuration and troubleshooting.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  
  If the problem persists after trying the above solutions, it may be necessary to escalate the issue to SAP support for further assistance.