How to evaluate variation of omission of particular work completely from the Contractors scpoe,details below?

Facts: Contract Lump sum based on FIDIC COC 4th Edition Query: When particular works is omitted from the Contractor's Scope completely, The quantity stated in the BOQ for the relevant works is found to be incorrect/different when it is measured(as per MOM) in Contract Drawings with Spec. For valuation of Variation, should we required to [...] http://bit.ly/onOrxI