A CPFF subcontract (not construction) is being closed out (we are the sub) and we need to understand what the order of preference is : PO or subcontract document, with regard to period of performance. There is nothing in the subcontract to state order of precedence. The PO indicates the extended period of performance, and it added value to the subcontract. The subcontract was not modified when the PO was modified.
Thanks.