deriving tax rates for accounts receivable transaction lines

If the tax classification code is specified as "Tax Code A" and the value of Detail DFF1 is Y, I want the tax classification code to be "Tax Code B".

Tax Determinant Set XXTAX_A
Transaction Input Element Determinant Character Attribute 1
Transaction Input Element Determinant Tax Classification Code

Tax Condition Set XXTAX_B
Tax Determinant Set Code: XXTAX_A
Transaction Input Element Determinant Character Attribute 1 = Y
Transaction Input Element Determinant Tax Classification Code = Tax Code A

Tax Rule
Direct Rate Determination Rule
Tax Condition Set: XXTAX_B
Tax Rate Result: Tax Code B

I tried the above settings, but it doesn't work properly and the tax classification code remains "Tax Code A."