How To Fix FS853 - External tax system has returned inconsistent total tax amount

SAP Error Message - Details

• Message type: E = Error

• Message class: FS - Messages from Tax Routines / Prenumbered Checks

• Message number: 853

• Message text: External tax system has returned inconsistent total tax amount

What causes this issue?

During tax calculation, your SAP system retrieves tax amount information
from the system of your external tax partner. This message indicates
that the total tax amount returned from your tax partner does not
correspond to the sum of the tax amounts from all jurisdiction levels.

System Response

The data returned from the external tax partner system could not be
verified.

How to fix this error?

Please contact your external tax partner to verify that they sent the
correct total tax amount. If your tax partner did return the correct
total tax amount, then contact SAP to recheck the verification logic.
If your tax partner did not return the correct total tax amount, then
your tax partner should adjust their logic to ensure that he or she
returns the correct total tax amount.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FS853 - External tax system has returned inconsistent total tax amount ?

  The SAP error message FS853, which states "External tax system has returned inconsistent total tax amount," typically occurs when there is a discrepancy between the tax amounts calculated by the external tax system and the amounts expected by SAP. This can happen in scenarios where SAP is integrated with an external tax calculation system, such as Vertex or Sabrix.
  Causes:
  
  Data Mismatch: The tax amounts returned by the external system do not match the amounts calculated in SAP. This could be due to incorrect data being sent to the external system or incorrect configuration in the external tax system.
  Configuration Issues: There may be configuration issues in either SAP or the external tax system that lead to different tax calculations.
  Tax Rate Changes: Changes in tax rates or rules that have not been updated in both systems can lead to inconsistencies.
  Currency Differences: If transactions involve multiple currencies, discrepancies can arise if the currency conversion is not handled correctly.
  Timing Issues: If the external tax system is not updated in real-time, there may be timing issues where the tax rates or rules have changed after the data was sent to the external system.
  
  Solutions:
  
  Verify Data: Check the data being sent to the external tax system for accuracy. Ensure that all relevant fields (like tax codes, amounts, and currencies) are correctly populated.
  Check Configuration: Review the configuration settings in both SAP and the external tax system. Ensure that tax codes, rates, and rules are consistent across both systems.
  Update Tax Rates: If there have been recent changes to tax rates or regulations, ensure that both systems are updated accordingly.
  Recalculate Tax: If possible, trigger a recalculation of the tax in the external system to see if the issue persists.
  Consult Logs: Check the logs in both SAP and the external tax system for any error messages or warnings that could provide more context on the issue.
  Contact Support: If the issue cannot be resolved internally, consider reaching out to SAP support or the support team for the external tax system for further assistance.
  
  Related Information:
  
  Integration Settings: Review the integration settings between SAP and the external tax system to ensure they are correctly configured.
  Documentation: Refer to the documentation for both SAP and the external tax system for any specific guidelines on handling tax calculations and error messages.
  User Forums: Check SAP community forums or user groups for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to identify the cause of the FS853 error and implement a solution to resolve it.