tax classification code placed on the lines that do not correspond to the items of the purchase orde

Hi!

The problem is when I associate an invoice to purchase order tax classification code placed on the lines that do not correspond to the items of the purchase order. However correctly calculated the tax with the items, but the code I see in the lines of the invoice does not correspond to the items of the purchase order, corresponds to the code to be defined the supplier.

I Check the defaulting hierarchy defined:

Ebusiness tax > Default Tax controls > Application tax defaults > Purchasing

and defaulting order is.

1- Item

2. Supplier Site

3. Supplier

Ebusiness tax > Default Tax controls > Application tax defaults > Purchasing