read-only field can edit by development tool
changed approach to not show the message, but save in log and stop operation on the read-only component
when change value of Entity Type to Dictionary, a message "Field is read only" is raise, you have to click ok some time. to can save new value.
it's by read-only logic change this field to read-only, and current onOpen is catch to process.
this event is not need to handle to avoid edit read-only file. patch
to fix it.
Thank you very much
use new method to implement.