This article shows how to create a JIRA link between the source and a destination issue and keep the link even if the issue has been Unexalated.
By default, the Exalate app displays remote issue link on the Sync panel, but once you 'Unexalate' an issue, the sync panel will be removed from the issue view.
In some cases, it would be handy to keep the remote issue link on the source issue, even if the synchronization is finished.
It could be achieved with the help of Jira Server API.
Incoming syncCheck the example below
The remote issue link display on the Sync panel and in the Issue Links section
The remote issue link remains in the Issue Links section (the issue is not under sync anymore)