Can we exempt a line on AP invoice exempt from Withholding Tax calculation

Summary:

My AP Invoice has two lines. One for 100 USD, other for 10 USD. Withholding tax rate is 10%. Due to some requirement, we need system to calculate tax of 10% only on 100 USD line while for 10 USD line, there should be no WHT tax calculation. We have to have both lines on invoice.

I created a WHT classification code WHT-NO TAX with 0% rate. Wrote a tax applicability rule for make tax 'Not Applicable' when tax input classification code is WHT-NO TAX.

With this rule in place, WHT tax calculation does not happen at all. Need to know if meeting this requirement is possible.