Tax at item level

Hi to all

I have a requirement to be able to setup Tax at item level, but using an specific tax area code

I have read the documentation and have setup a record in P4008 for this specific area code and the item number

but when I process a new sales order for a customer with a different tax area code, then the item is sold with the customer tax area code

so I looked for any kind of preferences that allow to change the tax area code but I can't find one

is there any way to make an item to not only use an specific rate, but also an specific tax area?