I requested historical data for the following fields
Required_fields = ['TR.EBIT', 'TR.ISOriginalAnnouncementDate', 'TR.EBIT.calcdate']
main_data,error = ek.get_data(['HDBK.NS'],Required_fields,{'SDate':str(0), 'EDate':str(-137), 'Frq':'M','Period':'FQ0','ConsolBasis':'Consolidated','ReportingState':'Orig'})
As in the given screenshot, there are duplicate ISOriginalAnnouncementDate with different data points.