Hi,
I am facing the same issue.. not sure if I am following as suggested:
I have created input parameter - Parameter type - Column and select on field - KUNNR. Default value is kept as constant.
Also create on calculated column - Column Type = "Attribute" and '$$<input_parameter variable>$$'
I am getting the pop-up to select value but after input it is showing all the data.. not restricting it..
Thanks & Regards,
Rajesh Dadwal