.setActivityState(new PreConditionCheckerState( this.activityScheduler, this.activity));
.setActivityState(new PreConditionCheckerState(this.activityScheduler, this.activity,true));
	public void previous ()	{		// s'il y a des produits en entree on revient au panneau permettant de		// voir les preconditions		if (this.activity.hasInputProducts()) this.activityScheduler				.setActivityState(new PreConditionCheckerState(						this.activityScheduler, this.activity));	}