R12 upgrade- Tax Codes & Supplier Bank Account

upgrade from R11 to R12

1. After assiging a tax code on the Expense Report  template and importing the expense report. When calculate tax is done on the invoice, the system calculates the tax for that line in the distribution inclusive of the line amount. example, invoice line is $100, invoice distribution is $90 and tax $10.

  i. how do i set the tax to be exclusive of the Line amount the tax is assigned to?

ii Why is it that the Tax is not reflected under Lines?

Oracle upgrade from R11 to R12

2. is there a white paper or note on how to create a new Tax????????