sl.bug.sl

I'm trying to create simple report using xml data source in jaspersoft studio. Everything was perfect until i've tried to use list. I've created sub data set in wizard, added xpath, checked fields preview - everything is ok. But on report preview tab i don't see list. Can anyone explain me what is wrong? my xml - https://gist.github.com/slbug/531a6d4069ea288e083e my jrxml - https://gist.github.com/slbug/e41d43a73bcc3c790c62