docs: public NotificationChain basicSetFixedCost(Parameter newFixedCost, NotificationChain msgs) {
  		Parameter oldFixedCost = fixedCost;
  		fixedCost = newFixedCost;
  		if (eNotificationRequired()) {
  			ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, BpsimPackage.COST_PARAMETERS__FIXED_COST, oldFixedCost, newFixedCost);
  			if (msgs == null) msgs = notification; else msgs.add(notification);
  		}
  		return msgs;
  	}