Commonwealth Numbered Regulations Commonwealth Numbered RegulationsAn application may be made by 2 or more persons, or against 2 or more persons, if:
(a) a separate proceeding could be made by or against each person in which the same question of law or fact might arise for decision; and
(b) all rights to relief claimed in the proceeding (whether joint, several or alternative) arise out of the same transaction or event or series of transactions or events.