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Once you have set up your external system, all you need to do is configure your project link. Please see the help topic Synchronizing Incident (JIRA) and Synchronizing Requirements with JIRA (JIRA) .
If you want to synchronize activities to JIRA using one of the external system configurations using the JIRA 5+ plugin, then you need to also add an activity stream of type "JIRA 5+ (BETA)" as well:
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