Track as an Asset

Can some one please suggest me on the below:

1. Employees use iExpense module to enter the expenses incurred. In that process they enter Expense Type "Taxes" to record Tax in iExpense module.

     --- While creating these expenses, we use  Expense Template. In the Expense template we provided "Projects Expenditure Type" field = Taxes.

     --- This issue happens when this template is used only.

2. These Tax lines transferred to AP are showing as Line Type "Item"

3. They are getting transferred to FA from AP with "Track as Asset" enabled.

Is it that we should leave "Projects Expenditure Type" empty ??

Thanks,

Siva