Please validate me

Question

My below read stmt is to working if I use BINARY SEARCH in READ STMT .
Do I need to use
SORT table gt_vbak  BY vbeln  kunn2 ?
just before
  LOOP at gt_vbpa INTO wa_vbpa.
to get use of Binary search ?
My code :
      BEGIN OF t_vbak,
          vbeln TYPE vbeln,
          vkorg TYPE vkorg,
          bstnk TYPE bstnk,
          kunnr TYPE kunnr,
          j_3adepm TYPE j_3adepm,
          zzactcnt TYPE zadi_v_cr535_actual_cnt,
          zzstatus TYPE zadi_v_cr535_status,
*For logic 4 -S
          j_3astcu TYPE j_3astcu,
          name2    TYPE NAME2_GP,
*For logic 4 -E
          kunn2    TYPE kunn2,
          count    TYPE i,
        END OF t_vbak,
        BEGIN OF t_vbpa,
          vbeln    TYPE vbeln,
          kunnr    TYPE kunnr,
          parvw    TYPE parvw,
*code add- start -20081020
        name2      TYPE NAME2_GP,
        J_3ASTCU   TYPE J_3ASTCU,
*code add- End   -20081020
        END OF t_vbpa.
I have delcared below itabs and workareas using above types
*Bring j_3ASTCU NAME2 fields into gt_vbpa from gt_vbak
  LOOP at gt_vbpa INTO wa_vbpa.
READ table gt_vbak INTO wa_vbak
                     WITH KEY vbeln = wa_vbpa-vbeln
                              kunn2 = wa_vbpa-kunnr
*BINARY SEARCH
       wa_vbpa-j_3astcu  = wa_vbak-j_3astcu.
       wa_vbpa-name2     = wa_vbak-name2.
       MODIFY gt_vbpa FROM wa_vbpa
                        TRANSPORTING j_3ASTCU NAME2
                        where vbeln  = wa_vbpa-vbeln
                        AND   kunnr  = wa_vbpa-kunnr
                        AND   parvw = wa_vbpa-parvw.
  ENDLOOP.       " LOOP at gt_vbpa INTO wa_vbpa
THANKS IN ADV.

Answer 1

Hi,
   Yes you have to sort the table begore you go for Binary search for that table in read statement.
Dont forget that the order in which you sort your internal table should be same as Key which you are using in Read statement.
i.e. if you are sorting your internal table
SORT t_vbak by vbeln kunnr
Then you can use binary search for theses read statements.
LOOP at t_vbpa.
1) Read table t_vbpa with key vbeln = t_vbpa-vbeln
                                           kunnr = t_vbpa-kunnr
                                           Binary search.
2)Read table t_vbpa with key vbeln = t_vbpa-vbeln
                                           Binary search.
Endloop.
But you cant use Binary search if the read statement is like this
1) Read table t_vbpa with key kunnr = t_vbpa-kunnr
                                           vbeln = t_vbpa-vbeln
                                           Binary search.
2)Read table t_vbpa with key Kunnr = t_vbpa-kunnr
                                           Binary search.
Regards,
Syed