Category/Subcategory reference selectors

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Hi,  I’m trying to build an app that uses two reference selectors. The first one displays the different areas (category) that a company has and the second one displays the departments (subcategory) that the previously chosen area has.   I’ve been following Reference Selector - Studio Pro 9 Guide | Mendix Documentation but i cant make it work myself.   The resulting preview is this, as you can see the dropdown is empty, same thing happens with the Department dropdown.
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