EDI 810 Handling Taxes

We are attempting to import Cardinal 810 invoices.  We can get all elements of the invoice except the tax.  The taxes are setup as "LT" and "ST".  Infor support is guiding up to the Mapping AOC cost.  We setup according to those standards but we still do not see the tax.  In our MA08.1 we have "LT" and "ST" pointing to one AOC code called "TX".  We setup the ED40 to point the Add On Cost to these.  The document that Infor is pointing us to has "LT" and "ST" specifically and they don't go in as an add on cost.   Is there special setup for these two specific codes in Infor?