app/models/tramway/event/participant.rb in tramway-event-1.9.18.2 vs app/models/tramway/event/participant.rb in tramway-event-1.9.19

@@ -33,10 +33,10 @@
     event :reserve do
       transition [ :requested, :without_answer, :waiting ] => :reserved
     end
 
     event :return_to_requested do
-      transition rejected: :requested
+      transition [ :prev_approved, :rejected ] => :requested
     end
   end
 
   scope :requested, -> { where participation_state: :requested }
   scope :waiting, -> { where participation_state: :waiting }