If a premium refund is set for the tariff, the default is the full contract period, except for deferred contracts (typically deferred life annuities), for which the deferral period is the refund period.
premiumRefundPeriod.default(params, values)
The length of the premium refund period (deferral period for deferred contracts, contract period otherwise)
The full parameter set of the insurance contract (including all inherited values from the tariff and the profit participation)
The values calculated from the insurance contract so far