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Issue hierarchies of Structures are currently not supported within v4.0, yet.
Integration into JIRA's dashboard as new Gantt-Chart column on a
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'Filter Result
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'-Gadget for more flexibility
As already documented above, you can display an integrated Gantt Chart within JIRA's search issue result: save that as named filter, share it to your mates and also use this filter by JIRA's gadget "filter result" on your dashboard to get an overview of project timing and progress.
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