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

FF840 - Overview

• 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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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 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