Should support scenario where a user selects "All male adults" cohort and drills down to display a dataset with all columns that were used to determine whether patient is in that cohort (i.e. identifier, age, gender).
One solution would be to let each element in a period indicator report be associated with a data set definition so it is displayed with the relevant columns when you're viewing the report.
Alternately the Web renderer for Period Indicator Reports should allow you to drill into a patient in the context of an indicator and see what cohorts (related to that indicator) the patient belongs to.
REPORT-106 has been rolled into this ticket.