The 'Synchronise' feature in helps you to preserve the integrity of the versions/components hierarchy in your project by detecting and repairing missing versions/components in the project hierarchy. You can run the project synchronisation manually or configure it to automatically detect and fix problems via listeners, if you have the appropriate administrator permissions.
To synchronise versions/components for a project,
You must have thefor a particular project to synchronise versions/components.
To configure to automatically synchronise versions/components,
You must have the 'JIRA Administrators' to configure to automatically synchronise versions/components.