Source field referring format during data export APIs tool

Hi,

I am trying to export the date from Commcarehq to the Ms-SQL server through
the Data Export API(
https://confluence.dimagi.com/display/commcarepublic/CommCare+Data+Export+Tool)
,and it is getting exported successfully for all the defined columns except
with the below system generated column names (appearing under properties) :

1.(info)Opened_date
2.(info)Closed
3.(info)Closed_date

I tried to define the above column name as similar name in the source filed
even tried to add as “info.” and “properties.info.”, but still not able to get any data after exporting into the SQL
server against the above column names.

Kindly suggest for the correct format for the above listed column names,
that should be defined in the source field in the configuration file (being
referred during the data export).

Thanks in advance.

With regards,
Gurudayal Sahu