[ALV] Disable Check box for some rows / Group field sudnt be repeated

Hi,

ALV List created through :

CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'

My Code for layout:

FORM form_build_layout_1301 CHANGING value(gs_layout_1301) TYPE
slis_layout_alv.
  gs_layout_1301-colwidth_optimize = 'X'. 
  gs_layout_1301-totals_only = 'X'.
  gs_layout_1301-totals_text = 'Total'.
  gs_layout_1301-totals_before_items = 'X'.
  gs_layout_1301-zebra = 'X'.
  gs_layout_1301-box_fieldname     = 'FLAG'.
  gs_layout_1301-detail_popup = 'X'. 
  SKIP.
ENDFORM.

<b>1.</b>

As you can see the itab-Flag (type char length 1) field is being used to show a check box infront of each rows.

these check boz will be selelected and a button will be pressed to create a PO order. Some rows shown here should have these check box disable. I know how to disable all the check box for entire ALV rows. but that is not what we want here.

<b>2.</b>

My ALV records are grouped on the basis of plant and sold-to party. code :

FORM form_build_sortcat_1301 CHANGING value(it_sort) TYPE
slis_t_sortinfo_alv.
  DATA ls_sort LIKE LINE OF  it_sort .

  CLEAR ls_sort.
  ls_sort-spos = '1' .
  ls_sort-fieldname = 'KUNNR'.
  ls_sort-up = 'X' . "A to Z
* Uncomment it, if you want to hav sum on the basis of subordernumber
*  ls_sort-subtot = 'X'.
*  ls_sort-expa = 'X'.
  ls_sort-down = space .
  APPEND ls_sort TO it_sort .


  CLEAR ls_sort.
  ls_sort-spos = '1' .
  ls_sort-fieldname = 'WERKS' .
  ls_sort-up = 'X' . "A to Z
* Uncomment it, if you want to hav sum on the basis of subordernumber
*  ls_sort-subtot = 'X'. 
*  ls_sort-expa = 'X'.
  ls_sort-down = space .
  APPEND ls_sort TO it_sort .
ENDFORM.

Whant we have is plant, sold-to in an orange stripe and then related record with check box in normal rows. but these rows are showing plant, sold-to (repeate) in front of each rows.

V want to see plant and sold-to in the sub-total line only and not repeatedly. i have tried

  gs_layout_1301-row = 1

but it is not giving me required GUI