PSC3 Option C - withholding payment

Under PSC3 Option C we believe, as the Employer, are entitled to a withhold sums against the Consultant’s in their application for payment as they have not allocated their costs correctly as identified in the WBS shown on their Accepted Programme i.e. other amounts to be paid to the Consultant less amounts to be paid by or retained from the Consultant. Would the Consultant in response have recourse to stand down the resources until their costs were fully paid ?