Added new field to ALV but not displaying the ouput

Hi guys,

I'm adding one more column to be displayed on an old existing program that uses REUSE_ALV_FIELDCATALOG_MERGE to generate the ALV fieldcat.

DATA : BEGIN OF itab OCCURS 0,

  matnr LIKE eina-matnr,

  extwg LIKE mara-extw,

  matkl LIKE mara-matkl,

  mtart LIKE mara-mtart,

  maktx LIKE makt-maktx,

  lifnr LIKE eina-lifnr,

  wglif LIKE eina-wglif,

<span style="color:red">idnlf like eina-idnlf,          " <----

new field</span>

  name1 LIKE lfa1-name1,

  profl LIKE mara-profl,

END OF itab.

  CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'

    EXPORTING

      i_program_name         = sy-cprog

      i_internal_tabname     = 'ITAB'

      i_client_never_display = ''

      i_inclname             = sy-cprog

•      i_bypassing_buffer     = 'X'

    CHANGING

      ct_fieldcat            = t_cat

    EXCEPTIONS

      inconsistent_interface = 1

      program_error          = 2

      OTHERS                 = 3.

I've added in a new field inside the ITAB internal table, but it wouldn't appear in the t_cat, only all the old fields will appear. What have i done wrong?