The Net PV (or NPV) displays the net present value of the remaining payments for this leg. It includes the accrued interest on the next coupon payment.
It is only displayed in the Single Option page.
If you use the BGM model, this result is only displayed if you have defined your own fixed rate, via the Market Rate field.
For a:
Swap this result is shown separately for each leg of the deal.
Loan this result does not take into account the initial borrowing/lending of the principal amount. This is according to market convention, whereby in the derivatives market a loan is always revalued without taking into account the principal payment paid/received at the start of the loan.
It is calculated as follows:
PV Loan + Accrued