Unable to debug HANA Table Function

Dear Experts,

Is it possible to debug a HANA Table function? When I try to do this from the webIDE editor, its not allowing me to click on the left hand side of the source code to create a break point. I have enabled debugging as below:

selected the SQL Debugger > Debug Browser and clicked on the 'Toggle Connection' button.

And I get the below message :

The SQL Debugging has been connected successfully...

However, I am unable to click on the left margin to create a break-point.

Thanks,

Ajith