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@tserenbat.uyanga Thanks for your question - unfortunately the Eikon Data API get_news_headlines call only provides Headline search queries at this time.
I will pass your suggestion over to the product owner.
News providers' codes
Fixed Income Government Auction Static Data
How can I filter News using story text in EIKON API?
Hope someone can help in regards to Eikon API -> Search Results Limitations
Is there a way to specify RIC patterns and non-empty RIC's when fetching News via EIKON API?