How To Fix 8A122 - The base of withholding tax type & is not defined as modified tax

SAP Error Message - Details

• Message type: E = Error

• Message class: 8A - Messages for Argentina

• Message number: 122

• Message text: The base of withholding tax type & is not defined as modified tax

What causes this issue?

You tried to define for a withholding tax type which tax processing
keys are taken into account to determine the modified tax amount. But
the corresponding withholding type is not defined as having the
modified tax amount as base.

System Response

The entry is not created.

How to fix this error?

If you want to have the modified tax amount as base you have to change
the withholding type definition.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 8A122 - The base of withholding tax type & is not defined as modified tax ?

  The SAP error message 8A122 indicates that the base of the withholding tax type specified is not defined as a modified tax. This typically occurs in the context of withholding tax configuration in SAP, where certain tax types need to be set up correctly to ensure that the system can calculate withholding tax accurately.
  Cause:
  
  Configuration Issue: The withholding tax type you are trying to use is not configured correctly in the system. Specifically, it may not be marked as a modified tax type in the configuration settings.
  Missing Tax Type Definition: The withholding tax type may not have been defined in the system, or it may not have the necessary settings to be recognized as a modified tax.
  Incorrect Assignment: The withholding tax type may not be assigned to the relevant company code or vendor/customer master data.
  
  Solution:
  
  
  Check Configuration:
  
  Go to the SAP Customizing Implementation Guide (SPRO).
  Navigate to Financial Accounting (New) > Accounts Payable > Withholding Tax > Withholding Tax Types.
  Ensure that the withholding tax type in question is defined and check if it is marked as a modified tax type.
  
  
  
  Define Modified Tax:
  
  If the withholding tax type is not defined as modified, you will need to edit the configuration to set it as modified.
  Ensure that the necessary parameters for the modified tax are correctly set.
  
  
  
  Assign Tax Type:
  
  Check the assignment of the withholding tax type to the relevant company code and vendor/customer master records.
  Ensure that the withholding tax type is correctly assigned in the vendor/customer master data under the withholding tax tab.
  
  
  
  Testing:
  
  After making the necessary changes, perform a test transaction to ensure that the error no longer occurs.
  
  
  
  Related Information:
  
  Documentation: Refer to SAP Help documentation for detailed steps on configuring withholding tax types and understanding modified tax types.
  Transaction Codes: You may use transaction codes like OBW1 (for defining withholding tax types) and FK02 (to change vendor master data) to navigate directly to the relevant settings.
  Support: If the issue persists after checking the configuration, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  By following these steps, you should be able to resolve the error message 8A122 and ensure that your withholding tax configuration is set up correctly.