According to Clause 11.2 (25) bullet point 2, Disallowed Cost is a cost that should not have been paid to Subcontractor in accordance with his contract.
Here comes the question, what if the cost is paid by the Contractor to the Subcontractor in accordance with their subcontract while on the other hand, the Project Manager found the cost is abnormal or he believe their is something wrong in the pricing / contract in the Subcontract?
For example, the WI requires the Contractor to construct 10 piles. The Contractor subcontracts the piling works. In the Subcontract, the Contractor asks the Subcontractor construct 15 piles. The Subcontractor eventually built 15 piles and the Contractor pays. The Project Manager would like to disallow the 5 additional piles. However, it seems that he cannot disallow it because the Contractor pays in accordance with the subcontract (Clause 11.2(25) bullet point 2)
Is there any solution for the Project Manager to deal with this issue?