collect statement issue

Hi all,

I have a requirement in which I am using Collect statement to club the numeric values.

TYPES: BEGIN OF  ST_VBBE ,
                  MATNR TYPE VBBE-MATNR,
                  WERKS TYPE VBBE-WERKS,
                  OMENG TYPE VBBE-OMENG,
            END OF ST_VBBE.
data : IT_VBBE TYPE TABLE OF ST_VBBE,
          WA_VBBE TYPE ST_VBBE,
          it_vbbe_f TYPE TABLE OF st_vbbe,
          WA_VBBE_F TYPE ST_VBBE.
START-OF-SELECTION.
       SELECT MATNR WERKS OMENG
                    FROM VBBE INTO TABLE IT_VBBE UP TO 500 rows.
BREAK-POINT.
LOOP AT IT_VBBE INTO WA_VBBE.
   COLLECT WA_VBBE_f INTO IT_VBBE_f.
ENDLOOP.

This is my code.. But I am not getting a single value in the table in which I am collecting the data.

I am getting the data in IT_VBBE.