Hi Madhan,
thanks for your suggestion. But in fact I need the column like ID not to be unique, because in our special use case the column only is used to group the data for the user. And in your suggested example you also can force the issue. Please try the following:
1. take your suggested modification
2. ungroup by ID
3. group by Name, (the second column, only groupe by this column)
4. open the group Afghanistan
5. change in the column KEY the value for one record to "Arizona" for example
6. change another value in the key column to any other value than "Arizona"
7. try to sort by the KEY column...
I also added a video file where you can see the effect.
Thanks, Markus
SF_Issue.zip