Looking for right RIC value for KOSPI 200 security
You can use RIC Search tool available on developers portal's front page
and select from the resulting hits similar to:
If you are a customer, you can contact Refinitiv content experts directly via Refinitiv Helpdesk Online -> Content and get the authoritative answer.
Refinitiv developers forums are dedicated to general questions and discussions centered around Refinitiv API usage, where they can be of most help to you, the majority of the members of the forums are developers, the moderators are Refintiiv API experts.
Hope this helps