Determination of changed item's comprehensive unit-price: with regard to the item to be
changed, if the same item is found in the Bill of Quantities, the comprehensive unit-price of
this same item in the Bill of Quantities shall prevail; if there is no the same item but a similar
item in the Bill of Quantities, the comprehensive unit-price of this similar item shall be the
reference of actual performance. [add any other reference if necessary]