First , that time we discussed with supplier. , we want to supplier cutting the steel before sent item to us, But that time in they process. the cutting machine of them is spoil , can't cutting steel to us , And we can't waiting 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.