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TR.BusinessSummary field does not support the localization parameter.
So it is not possible to retrieve this field in the local language via Eikon Data API.
Company trees don't match in Eikon online tool and the Eikon Proxy API
Trying to fetch Close Bid Price for CMO tranche from Python
What other parameters can be used with the statement pertaining to Corporate Actions data such as Stock Splits?
Retrieve Commodity Flows data using Python API
Download API Proxy Python for Windows.