The condition feature does work in subtrees, but there is a misbehavior in the selection dialog for the Condition property in the HMI designer. When using a condition of the object that also owns the view, the Condition property should just contain the name of the condition. The dialog adds a relative path up the model tree and back down again which does not work. But you can remove this path from the property.
We have planned to fix the selection dialog in the next version.
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