Accounting Entry

 In AP, when I create a transaction with tax, the accounting entry create:        Dr Expense 10.000
       Cr Liability   10.000
       Dr Tax          1.000
       Cr Liability    1.000
How can I set up to have the entry with only 1 Liability account?, like this:
       Dr Expense 10.000
       Dr Tax          1.000
       Cr Liability    11.000