Import Tax Line through interface table

 Hi all,

I'm trying to import an invoice line and tax line through the interface table.  I've already unchecked the Calculate Tax checkbox on the transaction type so that the system does not calculate the tax automatically.  I have also passed the link_to_transaction_attribute information.  The invoice got created, but the tax line stays in the interface table.  Could anyone please point out what I might missed.  We're in rel 11.5.  Below is the insert script

INSERT INTO ra_interface_lines_all
(
interface_line_context,
interface_line_attribute1,
interface_line_attribute2,
interface_line_attribute3,
interface_line_attribute4,
interface_line_attribute5,