We are aware of that issue. It occurs because we expect the Number type for the column that has the duration name. As formatters require using the template function, you can return any value there. And you no longer need to use the duration name for the column. If you change it to a different name, the export should work correctly: http://snippet.dhtmlx.com/5/a22795efc
We’ll add that information to our documentation articles.
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