internal clientinvoicerow ToNative() { return(new clientinvoicerow { quantity = Quantity, price = Price, product = new productreference { id = ProductId }, unit = Unit ?? string.Empty, description = Description ?? string.Empty, dimensions = DimensionEntries?.Select(x => x.ToNative()).ToArray(), period = AccrualsPeriod?.ToNative(), deliverydate = DeliveryDate.GetValueOrDefault(), deliverydateSpecified = DeliveryDate.HasValue, discount = Discount?.ToNative(), fields = Fields?.Select(x => x.ToNative()).ToArray(), accruals = Accruals?.Select(x => x.ToNative()).ToArray() }); }