Default Rates 
Default Rates
You can specify the rates of tax types ICMS, IPI and ISS independently of factors such as ship-from and ship-to destinations. If the system cannot derive a rate from the tables described in the following sections, it takes the default rates.
You can maintain default rates by choosing the Customizing path for
taxes.
Since material, ship-from and ship-to destination and so on are not available in FI posting transactions, the tax calculation routines always use the default rates for FI postings.