In my line of work, dealing with lenders, owners, general contractors, sub contractors, wholesalers, then the manufactures, in that order, each party had boiler plate terms and conditions that included penalties for late performance, consequencial damages, back charges...on and on.

The receiving party of a PO, acknowledged receipt, attached their terms and conditions denying acceptance of the T's & C's, the parties continued forward in good faith, then when the worst senario hit the fan, everyone squables back and forth, the bugs get worked out, nobody pays a penalty and they live to fight another day.

I day say UNXL is not protected.