abap not getting output. no syntax error but no data in output

REPORT zmanoj3.
TABLES : vbap , makt.

TYPES : BEGIN OF ty,
          vbeln TYPE vbeln,
          posnr TYPE posnr,
          matnr TYPE matnr,
          makt  TYPE makt,
        END OF ty.
DATA : it TYPE TABLE OF ty,
       wa TYPE ty.
DATA: num TYPE vbap-vbeln.

SELECTION-SCREEN BEGIN OF BLOCK b WITH FRAME TITLE TEXT-001.
SELECT-OPTIONS num1 FOR num.
SELECTION-SCREEN END OF BLOCK b.
DATA: it_fieldcat TYPE slis_t_fieldcat_alv,
      wa_fieldcat TYPE slis_fieldcat_alv,
      layout      TYPE slis_layout_alv.


DATA repid TYPE sy-repid.

START-OF-SELECTION.

  SELECT vbeln,
         posnr,
         matnr FROM vbap INTO TABLE @DATA(gt_vbap)
         WHERE vbeln IN @num1.

  IF sy-subrc EQ 0.

    SELECT matnr,
           maktx FROM makt INTO TABLE @DATA(gt_makt) FOR ALL ENTRIES IN @gt_vbap
           WHERE matnr EQ @gt_vbap-matnr.
    LOOP AT gt_vbap INTO DATA(wa_vbap).
      READ TABLE gt_makt INTO DATA(wa_makt) WITH KEY matnr = wa_vbap-matnr.
    ENDLOOP.

  ENDIF.


  wa_fieldcat-fieldname = 'vbeln'.
  wa_fieldcat-ref_tabname = 'vbap'.
  wa_fieldcat-seltext_m = 'Accounting Document Number'.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR wa_fieldcat.

  wa_fieldcat-fieldname = 'posnr'.
  wa_fieldcat-ref_tabname = 'vbap'.
  wa_fieldcat-seltext_m = 'Document Number'.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR wa_fieldcat.

  wa_fieldcat-fieldname = 'matnr'.
  wa_fieldcat-ref_tabname = 'vbap'.
  wa_fieldcat-seltext_m = 'Number'.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR wa_fieldcat.

  wa_fieldcat-fieldname = 'maktx'.
  wa_fieldcat-ref_tabname = 'makt'.
  wa_fieldcat-seltext_m = 'Accoun Number'.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR wa_fieldcat.

    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program = repid
      i_grid_title       = 'ACCOUNTING DOCUMENT DETAILS'
      it_fieldcat        = it_fieldcat
    TABLES
      t_outtab           = it.