How to use dataview carousel widget

Please advise how to use the dataview carousel widget. I don't know why but, the widget doesn't let me choose a caption and sort attribute. It only shows my Carousel entity. I defined two entities: Carousel CarouselImage (generalization of system.image) with two attributes: Caption (string) Order (integer) There is also a N:1 relation defined between CarouselImage and Carousel. I created a web form with a data view on the Carousel entity and placed the carousel widget in it.
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