How To Fix FF789 - Unable to determine tax reporting date due to incorrect input data

FF789 - Overview

• Message type: E = Error

• Message class: FF - FI Function Module Messages

• Message number: 789

• Message text: Unable to determine tax reporting date due to incorrect input data

What causes this issue?

The <DS:DE.VATDATE>tax reporting date</> is check using the rules of
BAdI: <DS:SIMG.VATDATE_VALUES>Define and Check Tax Reporting Date
(VATDATE_VALUES)</>.

System Response

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

How to fix this error?

Procedure for System Administrators

You may need to customize the check rules in your own BAdI
implementation.
For more information, see SAP Note 1232484.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message FF789 - Unable to determine tax reporting date due to incorrect input data ?

  The SAP error message FF789, "Unable to determine tax reporting date due to incorrect input data," typically occurs in the context of financial transactions, particularly when dealing with tax reporting and compliance. This error indicates that the system is unable to calculate the appropriate tax reporting date based on the data provided in the transaction.
  Causes:
  
  
  Incorrect Input Data: The most common cause is that the input data for the transaction is incorrect or incomplete. This could include:
  
  Missing or incorrect tax codes.
  Invalid posting dates.
  Incorrect company code settings.
  Missing master data (e.g., vendor or customer master data).
  
  
  
  
  Configuration Issues: There may be issues with the configuration settings in the SAP system related to tax reporting, such as:
  
  Incorrect tax determination settings.
  Missing tax reporting parameters in the configuration.
  
  
  
  Date Issues: The system may not be able to determine the tax reporting date if the posting date is outside the allowed range or if the fiscal year settings are