The respondent instituted two separate actions arising from the same contractual relationship. In the first action it claimed restitution in the form of repayment of the purchase price after cancellation of the contract due to breach. In a subsequent action, it claimed damages arising from the same breach and cancellation. The appellant raised the defences of res judicata (exceptio rei judicatae vel litis finitae) and the “once and for all” rule, contending that the second action was barred because the dispute had already been finally determined in the first action.