@yarin_benyakov Unfortunately even though you add a transition screen to the workflow there is no way you can add the field to the screen as it is a system field.
My only recommendation will be JQL queries so that developers can see that there is an open issue similar to the one he/she is working on.
from what I understood by a Suggestion on the very same request a different user had putting the link field to a transition screen is not fully working for linking remote issue (issues from a different Jira instance)
However, this specifically aims at the circumstance that selecting the remote server is not available.
Are your issues you want to link on the same instance?
I was able to put the issue links on a transition screen. Also I can confirm the link was established without problems - as long as the linked issue is on the same instance.
"instance" is usually used to describe separate services running independently of each other. An example would be the Jira that is running on a server in my house - one instance, then the DC install I'm working on for a client - another set of machines, a different url and nothing to do with the one in my house, that's another instance.
Nic explained it very well.
For your example the question was just if you are intending to link to an issue on the same server, f.e. jira.example.com/browse/DEMO-234 to jira.example.com/browse/TEST-432
- or -
to an issue on jira.someotherexamplecompany.org/browse/EVAL-789
The last example mentioned won't work, this is because of the Suggestion still open.
Linking an issue, though - this is possible like described in the screenshot.
This means: if you can continue with your requirement will depend on what you are intending to link actually.
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