Different account for free item in purchase order

Hi,

I did a research and I did not found nothing related to this, so I started this topic.

Here in Brazil, when we have a item marked as "free" in the purchase order, the account post need to be in a different account for the other itens because it's not a purchase. In this case, is a warranty material that we are importing from the company headquartes outside country.

Is there a way to do this ?

I'm sorry if this is in a wrong discussion group.

Thanks.

Amarildo