SSRS: How to Repeat Headers for Each Group

This article is going to share the information on
i) how to repeat headers for each group
ii.) how to overcome this error:

"An error occurred during local report processing .
The definition of the report '/Report ' is invalid .
The tablix 'Tablix' has a detailed member with inner members . Detail members can only contain static inner members ."

For example, consider the following sample data :

DECLARE @Tmp TABLE (Country VARCHAR

(30),City

VARCHAR

(30),Population

INT

INSERT @Tmp SELECT 'India','CHN'

,100

INSERT @Tmp SELECT 'India','MUM'

,400

INSERT @Tmp SELECT 'India','KOL'

,300

INSERT @Tmp SELECT 'US','NY'

,100

INSERT @Tmp SELECT 'US','CAL'

,300

SELECT * FROM @Tmp

Create Data source (providing server name , login credentials & database name) and then create Dataset as shown below :

Drag & drop List from Toolbox (or right-click on report body Insert - > List) on to the report body
and then drag & drop Table from Toolbox inside the List as shown below :

Then assign Dataset columns to the report Table columns :

After assigning columns , if we preview the report , we will end up with error as shown below :

Again goto the Design Pane, click on the List - > at the bottom , goto Row Groups - > =(Details) ->
in the drop down list click on Group Properties ...
Under Group Properties , follow the settings as shown in images below: