Customer Tab in MIGO overlapping standard excise tab .

Created custom tab at item level in MIGO transaction using MB_MIGO_BADI  and my problem is while executing the MIGO transaction after the implementation of BADI the standard EXCISE INVOICE tab is getting overlapped by my custom tab , So kindly help me to solve the problem ..

Code written under method PBO_DETAIL is

method if_ex_mb_migo_badi~pbo_detail.

   DATA : gf_class_id TYPE migo_class_id.

  DATA :g_no_input TYPE xfeld .

  DATA : g_line_id TYPE goitem-global_counter.

  DATA :gt_extdata TYPE ty_t_extdata.

  DATA : gv_inspect(42).

    gf_class_id = 'MIGO_BADI_IMPLEMENTATION _CIN'.

     e_cprog  =   'SAPMZ_MIGO_INSPECT'.

     e_dynnr  = '9990'.

     e_heading = 'Inspection Details'.

     g_line_id = i_line_id.

endmethod.