Help for creating a simple loop.....

Hi i have 2 internal tables
itab OCCURS 0 ,
       posnv LIKE vbfa-posnv,
       vbeln LIKE vbfa-vbeln,
       vbtyp_n LIKE vbfa-vbtyp_n,
       vbelv LIKE vbfa-vbelv,
flag TYPE i,
       END OF itab.
and
itab1 OCCURS 0,
       vbelv LIKE vbfa-vbelv,
       flag TYPE i,
       END OF itab1.
they are declared according to the fields in the table vbfa
and i want to set the itab1-flag to 1 if there's a situation when a record in itab contains the following values
itab - vbelv = itab1-vbelv
and
itab-vbtyp_n='M'
so i have used the following code
LOOP AT itab.
    LOOP AT itab1.
      IF itab-vbelv = itab1-vbelv AND itab-vbtyp_n = 'M'.
        itab1-flag = 1.
      ENDIF.
    ENDLOOP.
ENDLOOP.
but its not working. Please help me

Hi,
you have to change the loop as shown here........
loop at itab1.
loop at itab where vbeln = itab1-vbeln.
IF itab-vbelv = itab1-vbelv AND itab-vbtyp_n = 'M'.
itab1-flag = 1.
ENDIF.
endloop
MODIFY ITAB1 TRANSPORTING FLAG.
endloop.
Thanks and Regards,
Kunjal Patel

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