If:
(a) (payment): the State pays Project Co, or Project Co pays the State, any amount under clause 34.4(g) or otherwise; and
(b) (no entitlement): it is subsequently agreed or determined for any reason that the recipient was not entitled to that payment, in whole or in part,
the recipient will immediately refund that payment (or such part as constitutes an overpayment) as a debt due and payable to the party that made the payment together with interest calculated in accordance with clause 34.5 on that amount.