Help with some ABAP code

Question

I am trying to fill the quantity value if it is blank by looking for a record with the key and putting it's value in it.  the code is below but the part whee it says where order_qty > 0 is not working.  It just hops out even if it is.
CLEAR: T_SCHED_DATA, T_QUANTITY_DATA.
  REFRESH: T_SCHED_DATA, T_QUANTITY_DATA.
  SELECT DOC_NUMBER S_ORD_ITEM SCHED_LINE DSDEL_DATE REQ_DATE ORDER_QTY
   INTO TABLE T_SCHED_DATA
   FROM /BIC/AZSCH_O5400
     FOR ALL ENTRIES IN DATA_PACKAGE
    WHERE
     DOC_NUMBER = DATA_PACKAGE-DOC_NUMBER AND
     S_ORD_ITEM = DATA_PACKAGE-S_ORD_ITEM AND
     SCHED_LINE = DATA_PACKAGE-SCHED_LINE.
  SELECT DOC_NUMBER S_ORD_ITEM SCHED_LINE DSDEL_DATE REQ_DATE ORDER_QTY
   INTO TABLE T_QUANTITY_DATA
   FROM /BIC/AZSCH_O5400
    FOR ALL ENTRIES IN T_SCHED_DATA
    WHERE
     DOC_NUMBER = T_SCHED_DATA-VBELN AND
     S_ORD_ITEM  = T_SCHED_DATA-POSNR.
  T_QUANTITY_DATA2[] = T_QUANTITY_DATA[].
  sort t_quantity_data2 by vbeln posnr SCHED_LINE
       ascending.
sort t_quantity_data by vbeln posnr SCHED_LINE
       ascending.
  loop at T_QUANTITY_DATA into LF_DATA
    where order_qty > 0.
      loop at T_QUANTITY_DATA2 into LF_DATA2
      where
       vbeln = LF_DATA-VBELN AND
       posnr = LF_DATA-POSNR AND
       DSDEL_DATE = LF_DATA-DSDEL_DATE AND
       SCHED_LINE NE LF_DATA-SCHED_LINE and
       order_qty = 0.
        lf_data3 = lf_data2.
        move LF_DATA-order_qty to lf_data3-order_qty.
        append lf_data3 to T_QUANTITY_DATA3.
      endloop.
  endloop.

Answer 1

loop at T_QUANTITY_DATA into LF_DATA
where <b>order_qty > 0.</b> <b> " when this is greater than zero</b>
loop at T_QUANTITY_DATA2 into LF_DATA2
where
vbeln = LF_DATA-VBELN AND
posnr = LF_DATA-POSNR AND
DSDEL_DATE = LF_DATA-DSDEL_DATE AND
SCHED_LINE NE LF_DATA-SCHED_LINE and
<b>order_qty = 0.</b>  <b>" how can it be zero here</b>
lf_data3 = lf_data2.
move LF_DATA-order_qty to lf_data3-order_qty.
append lf_data3 to T_QUANTITY_DATA3.
endloop.
endloop.