People click Transitions by mistake from time to time. It's once in a while, still in training when you move the mouse over any Transition you know that click it by mistake is hard to Undo. In our case to Undo a mistaken Transition clicked we need to go and create a "temporary" Transition to go back and then delete that "temporary" Transition, which requires to move all records in actual states to the new versions. So, it makes sense a simple "Ok/Cancel" window to confirm the Transition was clicked.