I have a list of ISINs for which I would like to obtain the Fitch Long-term Issue Credit Rating at a specific date using the Eikon API. More precisely, I would like to obtain such rating for the 30th December 2022. I have tried using the following command:
data, err = ek.get_data(instruments=AllISIN_test[0:1000], fields="TR.GR.RatingSuffix(SDate=2022-12-28,BondRatingSrc=FTC,Filling=Prev)")
but I am not obtaining any data. Does anyone have any leads as to how to obtain this info through the Python API?