Use of Input parameter in hana Calculation view

Hello all,

I am creating Calculation view by using two different Calculation view.

I have used 2 Projection nodes to add Calculation views.

the 2 calculation views has 3 same input parametrs ID,ValidFrom,ValidTo.

Do i need to create input parameters in my new calculation view?

Do i need to map the my new input parameters to underlying calculation views?

right now I have not created input parameters but still the select query is returning data with placeholder clause..

select * from calview

(placeholder."$$ID$$==>

placeholder."$$ValidFrom$$==>

placeholder."$$ValidTo$$==> );

Please help..