Retrieve dimension value in Design studio 1.5

Hello,

I have the below table in the data source coming from BEx, (Usernames and their roles).

The initial view of my DS has the column "Role" and I wanted to retrieve the value of the role(Dimension value) corresponding to the user login.

Say if User 2 logins, then I wanted to retrieve the value as "Role 3" and display as text.

I tried using the below methods but didn't work.

TEXT_1.setText(DS_1.getDimensionText("Role");

Appreciate your help

Thanks,

Vishal.