How import invoices without tax

Hello,

I want to know if it is possible to import lines of AP invoices without tax and that when executing the import I do not derive the tax 
from anywhere. Let it be empty.
I have tried to insert 1 line of ITEM type in the ap_invoice_lines_interface and when executing the standard import of AP invoices, 
I import it with tax, deriving it from me and I don't want it to be derived

Thanks,

Iker