I don't understand how this field works, i can't set any value ..
Is someone know ?
It's a bit buried in the docs, but it is there - the field "can only be set by code or when importing". There is no code for setting it in the core of JIRA (apart from the import option), you have to find or write an add-on to do it.
What are you trying to use the field for? I ask because there may be a better option - a lot of people try to set this field when they want to put text on screen - this would unnecessarily fill up your database with lots of static duplicated data, and won't come out on the "edit" type screens anyway. There's a different answer to that.
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Like this
Ok, a read-only text field won't work - they only show up on issue-view and searches.
Is that going to be the same url every time, or is it going to vary by issue/project?
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