Import OPML File

I am trialling DevonThink Pro 2.0

I have imported an OPML file exported from OmniOutliner. The Outline is correctly shown as groups BUT the lowest level of data is missing. Shouldn’t the lowest level of data be shown as a text item ?

I have checked the file in Preview and the data is there in the file.

If I import the OmniOutliner file itself I can see all levels but only as a single item in Devonthink. I want to import the data so I can search and immediately see the data.