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For ETFs you can use TR.ETPConstituentRIC field. See an example on this thread.For mutual funds holdings history is not available through Eikon APIs. Refer to this thread for a bit more detail.
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How to get the full news story in CSV in Text Style
Equity Screener Python
Unable to connect to Eikon API from Python. Error Code 500.
ROIC Data: DFO code vs. Eikon Code