How do i extract base amount, cst amount of an item in rseg?

my queries:

SELECT

          KWERT

      FROM KONV INTO  CORRESPONDING FIELDSOFTABLE IIT_SEG2

   FORALL ENTRIES IN IT_SEG

            WHERE KNUMV = IT_SEG-KNUMV AND KPOSN = IT_SEG-BUZEI AND KSCHL ='JIPC'.

and

   SELECT

          KWERT

      FROM KONV INTO  CORRESPONDING FIELDSOFTABLE IT_RSEG

      FORALL ENTRIES IN IT_SEG

            WHERE KNUMV = IT_SEG-KNUMV AND KPOSN = IT_SEG-BUZEI AND KSCHL ='BASB'

are fetching no vals... is my query apt for fetching base amount and cst amount?