Reg comparison of two internal tables

Question

hi friends,
please help me solving this.
there are two internal tables t_zvs38 and t_value
1.t_value like seahlpres
2.t_zvs38 like zvs38.
values in t_value will be like this.
first line wil contain zmdtype(mandatory document) and second line will contain
zmdtypet (the description for zmdtype).
eg.
D001 -
-zmdtype
internal----
zmdtypet
D002
external
D003
renewal
values in t_zvs38.
for a particular sales.org the zmdtype is filled.
select vkorg zmdtype into corrsponding fields of table t_zvs38
where vkorg = p_vkorg.
Now i want to compare t_value and t_zvs38 with field zmdtype
and delete the contents of  t_value which are not in t_zvs38.
i have written like this.
loop at t_value.
read table t_zvs38 with key zmdtype = t_value-string.
if sy-subrc ne 0.
delete t_value. "to delete zmdtype
sy-tabix = sy-tabix + 1.
  delete t_value. " to delete zmdtypet
else.
sy-tabix = sy-tabix +2. "to go to next zmdtype.
endif.
endloop.
but it is deleting all the contents of t_value.
points are assured.

Answer 1

CLEAR zvs32t.
  SELECT zvs32tzmdtype zvs32tzmdtypet
    INTO (zvs32t-zmdtype, zvs32t-zmdtypet)
    FROM zvs32t
    JOIN zvs32
    ON   zvs32tzmdtype = zvs32zmdtype
    WHERE zvs32t~spras    = sy-langu
    AND   zvs32~zfrenewal = space.
     WRITE zvs32t-zmdtype TO t_value.
    APPEND t_value.
    WRITE zvs32t-zmdtypet TO t_value.
    APPEND t_value.
  ENDSELECT.
  SELECT vkorg vkbur zmdtype FROM zvs38 INTO CORRESPONDING FIELDS OF TABLE t_zvs38
  WHERE vkorg = p_vkorg
AND vkbur = p_vkbur.
  LOOP AT t_value INTO wa_area1.
    v_index = sy-tabix.
    READ TABLE t_zvs38 INTO wa_area2 WITH KEY zmdtype = wa_area1-string
  BINARY SEARCH.
   IF sy-subrc NE 0.
      IF l_flag IS INITIAL.
        DELETE t_value INDEX v_index.
       ELSE.
        CLEAR l_flag.
      ENDIF.
   ELSE.
      l_flag = 'X'.
   ENDIF.
  ENDLOOP.
Using this code ,i am unable to ge the correct output.Thank u all for ur help.