issue in For all Entries

Hi,

     I have an issue Regarding For all entries stament,

my statement is

SELECT   EBELN

                ebelp

               LOEKZ

               MATNR

               BUKRS

               WERKS

               MATKL netwr  from ekpo INTO TABLE tb_ekpo  FOR ALL ENTRIES IN tb_pack1 WHERE  loekz ne 'L'

               and matkl = tb_pack1-matkl.

but the statment is retrieving 0 entries into internal table  tb_ekpo , and tb_pack1 has 2 entries.

tb_pack1 entries are,

sno   text                                                      Matkl

2      REINFORCED CEMENT CONCRETE     115

2      REINFORCED CEMENT CONCRETE     100

I have checked  entries in ekpo table ,with same conditions , it shows forty entries.

where i might have been wrong,

please Help.