ยง 3003. Action for periodic payments due under pension or retirement contract no bar to action for future installments. The commencement or maintenance of an action for the recovery of payments which have become due under the terms of a written agreement providing for the payment of a pension or retirement compensation or deferred compensation for a period of years or for life, whether or not such agreement is part of an employment contract, shall not be deemed to bar subsequent actions to recover payments thereafter becoming due under the terms of such agreement.