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)
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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