Select statement is not fetching data???

Dear ABAP'ers,

I have a written a select statement which is not fetching data from the table .

passing values in so_werk, so_budat, so_arbpl

SELECT a~werks a~budat a~qualf a~urcod a~arbpl a~katalogart a~urgrp a~urcod a~version

            a~iserh

     INTO   CORRESPONDING FIELDS OF TABLE itab1

     FROM   zctsi_pw AS a

     WHERE  a~werks IN so_werk

     AND    a~budat IN so_budat

     AND    a~arbpl IN so_arbpl

     AND    a~aufnr IN so_aufnr

     AND    a~urgrp IN so_urgrp

     AND    a~urcod IN so_urcod.

kindly guide me to solve the issue.