L3 - Default In this case, an exception should be thrown, since there can be at most one process definition receiving a start message with a specific name. This is a regression in 7.2 and work with 7.1.
Reason:
Quite likely has to do with the DbEntityCache and the keys under which a message event subscription created during deployment is put into the cache (cf DbEntityCache, DbEntityCacheKeyMapping and the logic that creates and inserts the MessageEventSubscriptionEntity into the cache)