JIRA Core does not offer this by default. You can use JIRA Utilities Plugin https://marketplace.atlassian.com/plugins/com.googlecode.jira-suite-utilities/server/overview. This will enable a set custom field value in a post function in your workflow.
Hmm, I may not have enough permission to see all of the info in this ticket or what?
I saw only the title to be: "How do I set a read only custom field value?" and one line description "How it's possible to update a value of a read only custom field through JIRA UI?"
Do you mean that there is more description than that one liner here for this ticket? Just curious to know if I miss something here.
Yes, Nic, it's exactly that. I understand that a read only custom field should not be update through UI, but I was wondering what would be the purpose of it if I could not updated it at all.
The only way JIRA Core offers this out of box is while importing from CSV through JIM, but setting them in the workflow looks a good alternative.
From memory, it's a hang-over from the old Mantis importer, which has been absorbed into JIM now. Might be one of the other old importers though - it's been a while since I looked.
Nevertheless, it's a useful field for any importer, as you usually want to keep at least the old system's reference number and never change that. It also has a lot of other uses too, as long as you are willing to do the coding (or use an add-on that has coded for you, such as JIRA Suite Utilities, as you say)
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