[PAULUS libro septuagensimo ad edictum. ] §44.2.6.prSingulis controuersiis singulas actiones unumque iudicati finem sufficere probabili ratione placuit, ne aliter modus litium multiplicatus summam atque inexplicabilem faciat difficultatem, maxime si diuersa pronuntiarentur.
[PAULUS, in the seventieth book on the Edict.] It has been approved for a plausible reason that for individual controversies individual actions and a single end of judgment should suffice, lest otherwise the multiplied quantity of lawsuits should cause a supreme and inexplicable difficulty, especially if contradictory decisions were to be pronounced.
parere ergo exceptionem rei iudicatae frequens est.
Therefore, it is common for the exception of res judicata to arise.