This field shows attribute of record from dictionaries. For example, we can show Reporter's Phone or Company's Address or something like that:
We can use this field just for read only on the View Issue Screen. To add this field to an issue screen go to JIRA Administration menu/Custom Fields:
After that go to the field Configure:
and define a field attribute you want to show in the field:
Here you must define a field attribute (you could find it in the JIRA Administration menu/Plugins/CRM):
Value will have filled after creating and editing issue.
To find issues just add the field to the search conditions: