Issue to retrieve TimeSeries for CORRA index

anass.yazane.1

Dear Developer community

I encounter an issue to get CORRA timeseries using get_timeseries method (data=ek.get_timeseries(rics='CORRA=',fields='CLOSE', interval='daily', count=20)).
Indeed, i get a error showing 'eikon.eikonError.EikonError: Error code -1 | CORRA=: No data available for the requested date range | '.
When i use RHistory Excel function i can retrieve data without any issue
Also, can you tell me how can i get calendar historical including weekend and holidays, it doesnt work even if i include 'calendar='calendardays''.
many thanks for your help.