Any reversionary pensions paid in respect of the deceased spouse are automatically deducted from the amount of the compensatory allowance, where the latter, on the date of death, took the form of an annuity. If the heirs exercise the option provided for in article 280-1 and unless otherwise decided by the judge, a deduction of the same amount shall continue to be made if the creditor loses his entitlement or suffers a change in his entitlement to a reversionary pension.