Start Level 1 Node: Maintaining MessagesMaintaining MessagesEnd Level 1 Node: Maintaining Messages
   Start Level 2 Node: Creating Message ClassesCreating Message ClassesEnd Level 2 Node: Creating Message Classes
   Start Level 2 Node: Adding MessagesAdding MessagesEnd Level 2 Node: Adding Messages
   Start Level 2 Node: Creating Message Long TextsCreating Message Long TextsEnd Level 2 Node: Creating Message Long Texts
   Start Level 2 Node: Assigning IMG Activities to a MessageAssigning IMG Activities to a MessageEnd Level 2 Node: Assigning IMG Activities to a Message