Factories not destroyed when captured

[RogerCooper]

I have a factory defined as follows:

    <attachment name="unitAttachment" 
		 attachTo="factory"
		 javaClass="games.strategy.triplea.attachments.UnitAttachment"
		 type="unitType">
		 <option name="isFactory" value="true"/>   
   <option name="maxBuiltPerPlayer" value="3"/>
   <option name="destroyedWhenCapturedBy" value="Russians:Germans:British:Japanese:Americans"/>
    </attachment>

It is not getting destroyed when captured. I am doing something wrong?

[Cernel]

@rogercooper When stuff is ineffective, that probably means it is enabled by a property you don't have true.
In this case, "Units Can Be Destroyed Instead Of Captured".

[RogerCooper]

Thanks for the help. The xml option browser should be updated to reflect the dependency

[Cernel]

@rogercooper Also:
https://forums.triplea-game.org/topic/595/short-attachment-names