Fields are still editable on the Change Request created from Standard Change Template, even after including those in "readonly_fields" of the Standard Change properties.
Any supported release
Client script "Mark standard change fields readonly" has been modified.
We have a Client Script in the OOTB named "Mark standard change fields readonly" which make the fields Read-only on the Change Request created from Standard Change Template.
This is an onLoad client script defined on the "change_request" table.
The client script checks for the values entered into the "Read-only fields" field in the Standard Change Properties page.
Change>Administration>Standard Change Properties
If this client script has been modified or the script which verifies the system property has been altered, the fields won't be set to read-only.