3 Terms of the buyer in paragraph 4 vs. terms of the seller in paragraph 6. Seller's terms are in conflict with buyer's. This is bearing on the issue of material alteration but it doesn't seem like a conflict of material value. There is no material conflict here. Scenario 4 Seller's paragraph 7 vs. paragraph 1 and 2 of the purchase order.
Issue is procedural.
There has to be notice and written consent.