How To Fix FF840 - Account key for automatic posting line item taxes not filled &1

SAP Error Message - Details

• Message type: E = Error

• Message class: FF - FI Function Module Messages

• Message number: 840

• Message text: Account key for automatic posting line item taxes not filled &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FF840 - Account key for automatic posting line item taxes not filled &1 ?

  The SAP error message FF840 indicates that there is an issue with the account key for automatic posting of line item taxes. This error typically arises when the system is unable to determine the appropriate account key for tax postings during the processing of financial documents, such as invoices or payments.
  Cause:
  
  Missing Account Key: The account key for tax postings is not defined in the configuration for the relevant transaction or document type.
  Incorrect Configuration: The tax configuration in the system may not be set up correctly, leading to the inability to derive the account key.
  Document Type Issues: The document type being used may not be linked to the correct tax codes or account keys.
  Tax Code Issues: The tax code used in the transaction may not have a corresponding account key assigned.
  
  Solution:
  
  
  Check Tax Configuration:
  
  Go to the transaction code OB40 (for defining account keys) and ensure that the account key for tax postings is correctly defined.
  Verify that the account key is assigned to the relevant tax codes in the configuration.
  
  
  
  Review Document Type Settings:
  
  Use transaction code OBYX to check the settings for the document type being used. Ensure that it is configured to allow for tax postings and that the correct account keys are assigned.
  
  
  
  Verify Tax Codes:
  
  Check the tax codes in transaction code FTXP to ensure that they are correctly configured and that they have the appropriate account keys assigned.
  
  
  
  Test Posting:
  
  After making any necessary changes, try to post the document again to see if the error persists.
  
  
  
  Consult Documentation:
  
  Review SAP documentation or consult with your SAP support team for specific guidance related to your system configuration.
  
  
  
  Related Information:
  
  Transaction Codes:
  
  OB40: Define Account Keys
  OBYX: Document Type Configuration
  FTXP: Maintain Tax Codes
  
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  User Roles: Ensure that the user has the necessary authorizations to make changes to the configuration settings.
  
  If the issue persists after following these steps, it may be beneficial to engage with your SAP support team or consult with an SAP expert for further assistance.