A good question!
This turns on how you read the definition of defined cost (being a component of the price for work done to date which is the basis of interim payment).
Under Option C defined cost under clause 11.2(23) is the amount of payments due to subcontractors... That must mean that your first option cannot apply because the definition is, quite rightly, looking at payments due not actually made. That does not however mean that your second option is entirely correct. You now have to read the definition of PWDD more closely.
11.2(29) defines PWDD as the Defined Cost which the PM forecasts will have been paid...before the next assessment date. Therefore, what you are looking for is payment liability accruing to the contractor in month one that will crystallise as having been paid in month 2.
Therefore, the real answer is somewhere between your two options. The amount for subcontractors is the amount accruing in this month which will have been paid next month. To ascertain this precisely you obviously need to look at the terms of the subcontract. However, in a practical sense, your option 2 is closest to what usually happens even if it doesn't quite align with the contract.
This turns on how you read the definition of defined cost (being a component of the price for work done to date which is the basis of interim payment).
Under Option C defined cost under clause 11.2(23) is the amount of payments due to subcontractors... That must mean that your first option cannot apply because the definition is, quite rightly, looking at payments due not actually made. That does not however mean that your second option is entirely correct. You now have to read the definition of PWDD more closely.
11.2(29) defines PWDD as the Defined Cost which the PM forecasts will have been paid...before the next assessment date. Therefore, what you are looking for is payment liability accruing to the contractor in month one that will crystallise as having been paid in month 2.
Therefore, the real answer is somewhere between your two options. The amount for subcontractors is the amount accruing in this month which will have been paid next month. To ascertain this precisely you obviously need to look at the terms of the subcontract. However, in a practical sense, your option 2 is closest to what usually happens even if it doesn't quite align with the contract.