8.43 In accordance with Treasury Technical Note No. 1 (Revised), a book entry is required in the NHSScotland body's operating cost statement in order that the undiscounted reduction in the annual payment is fully recognised. The amount in question is calculated as the difference between the undiscounted total annual payment reductions and the NPV of the payment reductions. This should be recorded as interest receivable with a corresponding addition to the PPP expenditure over the same period as the write-off of the debtor (para 41).