First , that time we discussed with supplier , we want to supplier cutting the steel before sent item to us, But that time they handover order cutting machine of them is spoi , can't cutting steel to us , And we can't watting for they maintenance because this PO. is urgent. Supplier give discount that they can't cutting steel to me , they transfer discount to us already.All thing is reson that they must Revise PO. for you sign approve again.