Withholding tax is not applying to invoice line from Supplier Site

Summary:

Withholding tax is not applying to invoice line from Supplier Profile

Content (please ensure you mask any confidential information):

Hello

I setup the following task, however , the WTH is not working, hence I was wondering if the tax must be setup as applicable instead of not applicable.

Manage Tax Regimes + Configuration Options
Manage Taxes + Tax Rule Defaults —- I setup as not applicable
Manage Tax Rates and Tax Recovery Rates - the rate expected to be calculated;
Manage Tax Rules —Setup as transaction input factor as WTH

Supplier Setup - Profile - Income Tax - Use withholding tax is checked;