ICE matching algorithms provide for matching purchase order lines to invoice lines to validate before submitting to your AP system. While on many invoices the invoice lines are in the same order as the PO lines, that is not always the case. ICE processing does not require the PO lines to be in the same order as the invoices lines for successful matching. ICE will programatically figure out which lines on the invoice match which lines on the PO to provide back the exact invoice line number that matches to each PO line.