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

SAP Error Message - Details

• 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 not properly configured.
  
  
  Document Type Issues: The document type used for the transaction may not be set up correctly for tax reporting.
  
  
  Solutions:
  
  
  Check Input Data: Review the transaction data for any missing or incorrect information. Ensure that:
  
  All required fields are filled out correctly.
  The tax codes are valid and applicable to the transaction.
  
  
  
  Review Configuration Settings: Check the configuration settings related to tax reporting in the SAP system. This may involve:
  
  Verifying tax codes and their settings.
  Ensuring that the tax reporting parameters are correctly defined in the system.
  
  
  
  Validate Dates: Ensure that the posting date and tax reporting date are within the valid range. Check the fiscal year settings and make sure they are correctly configured.
  
  
  Document Type Verification: Ensure that the document type used for the transaction is configured to allow tax reporting. You may need to consult with your SAP configuration team to verify this.
  
  
  Consult SAP Notes: Check for any relevant SAP Notes or updates that may address this specific error. SAP frequently releases updates and patches that can resolve known issues.
  
  
  Testing: After making corrections, test the transaction again to see if the error persists. If it does, further investigation may be required.
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on tax reporting and configuration.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Support: If the issue persists after troubleshooting, consider reaching out to SAP support for assistance.
  
  By following these steps, you should be able to identify the root cause of the FF789 error and implement the necessary solutions to resolve it.