How To Fix 6A666 - Due date used as a basis for tax calculation

SAP Error Message - Details

• Message type: E = Error

• Message class: 6A - Real estate messages rent adjustment

• Message number: 666

• Message text: Due date used as a basis for tax calculation

What causes this issue?

The due date for the item was used as a base for the tax calculation
per cash flow item. The amount indicated may therefore deviate from the
amount already posted or to be posted since the posting date or
document date was used as a base for the debit position.

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

System Response

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 6A666 - Due date used as a basis for tax calculation ?

  The SAP error message "6A666: Due date used as a basis for tax calculation" typically occurs in the context of tax calculations in SAP, particularly when dealing with invoices or payment processing. This error indicates that the system is trying to use a due date for tax calculation, which is not allowed or not configured correctly.
  Cause:
  
  Incorrect Configuration: The tax calculation settings in the system may not be configured to allow the use of due dates for tax calculations.
  Document Type Settings: The document type being used may not be set up correctly to handle tax calculations based on due dates.
  Tax Code Issues: The tax code associated with the transaction may not be configured properly, leading to issues in tax calculation.
  Data Entry Errors: There may be incorrect or missing data in the transaction that is causing the system to default to using the due date.
  
  Solution:
  
  
  Check Configuration:
  
  Review the tax calculation settings in the SAP system. Ensure that the configuration allows for the appropriate basis for tax calculations.
  Navigate to the relevant configuration settings in SPRO (SAP Project Reference Object) and check the tax calculation rules.
  
  
  
  Review Document Type:
  
  Check the settings for the document type being used. Ensure that it is configured to handle tax calculations correctly.
  You can do this by going to the document type configuration in the Financial Accounting (FI) module.
  
  
  
  Verify Tax Codes:
  
  Ensure that the tax codes used in the transaction are correctly configured. Check if the tax codes are set up to use the correct basis for tax calculation.
  You can review tax code settings in the transaction code OB40.
  
  
  
  Data Validation:
  
  Review the transaction data for any inconsistencies or missing information. Ensure that all required fields are filled out correctly.
  Check the due date and other relevant fields to ensure they are set correctly.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for specific guidance on the error message and its resolution.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the above points, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as FB60 (Enter Incoming Invoice), FB70 (Enter Outgoing Invoice), and OB40 (Maintain Tax Codes).
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may resolve the issue.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.