Read Only Text Field Cannot be Cleared

It affects built-in

"Text Field (Read Only)"
* This is the one that must be updated via code

Steps to Reproduce

• Create a new issue ticket where the field is visible
• Add a value to the field via REST API:

  curl -D- -u admin:admin -X PUT --data '{"fields":{"customfield_10200":"something for something"}}' -H "Content-Type: application/json" http://localhost:8080/rest/api/2/issue/SSP-24
  

  • in my case, the field id is 10200 and the ticket that I'm modifying is SSP-24
• Verify that the new value exists by accessing the ticket via web browser
• Now attempt to clear the field. For example these work for other text fields (single line and multi-line):

  curl -D- -u admin:admin -X PUT --data '{"fields":{"customfield_10200":null}}' -H "Content-Type: application/json" http://localhost:8080/rest/api/2/issue/SSP-24
  
  curl -D- -u admin:admin -X PUT --data '{"fields":{"customfield_10200":""}}' -H "Content-Type: application/json" http://localhost:8080/rest/api/2/issue/SSP-24
  

• Reload the issue ticket and the ticket still has a value in it

Workaround: updating the field to only contain a space:

curl -D- -u admin:admin -X PUT --data '{"fields":{"customfield_10200":" "}}' -H "Content-Type: application/json" http://localhost:8080/rest/api/2/issue/SSP-24

• Looks like you need to have some sort of data, so it requires that extra (space) within the " "
• The downside to this workaround is if there are JQL attempting to filter for this field as EMPTY