Append to internal table

Question

Dear All!
Please can you check what is wrong on appending
of internal table III_YMMM_TBL74.
It's going to be overwriting always.
All what I want to do is populating
III_YMMM_TBL74 while is condition
if sy-subrc = 0 AND linp > 1.
is complied
*CODE
TYPES:   BEGIN OF    YMMM,
           MATNR     LIKE YMMM_TBL74-MATNR,
           VORG_NR   LIKE YMMM_TBL74-VORG_NR,
           LIFNR     LIKE YMMM_TBL74-LIFNR,
           NAME1     LIKE YMMM_TBL74-NAME1,
           UNGUEL_AB LIKE YMMM_TBL74-UNGUEL_AB,
           GUEL_AB   LIKE YMMM_TBL74-GUEL_AB,
           GUEL_BI   LIKE YMMM_TBL74-GUEL_BI,
         END OF YMMM.
data I_YMMM_TBL74   type  YMMM occurs 0 with header line.
data II_YMMM_TBL74  type  YMMM occurs 0 with header line.
data III_YMMM_TBL74 type  YMMM occurs 0 with header line.
select * from YMMM_TBL74
         INTO CORRESPONDING FIELDS OF table I_YMMM_TBL74.
sort I_YMMM_TBL74 by matnr.
DELETE ADJACENT DUPLICATES FROM I_YMMM_TBL74 COMPARING matnr.
data: linp type i,
     fin  type i,
     rin  type i.
LOOP AT I_YMMM_TBL74.
select * from YMMM_TBL74
          INTO CORRESPONDING FIELDS OF table II_YMMM_TBL74
          WHERE MATNR = I_YMMM_TBL74-MATNR .
DESCRIBE TABLE II_YMMM_TBL74 lines linp .
DESCRIBE TABLE I_YMMM_TBL74 lines fin .
if sy-subrc = 0 AND linp > 1.
III_YMMM_TBL74[] = II_YMMM_TBL74[].
append III_YMMM_TBL74[].
endif.
ENDLOOP.
write:/ ''.

Answer 1

Hi,
Since you have already moved using the = statement with the body operator..You don't have use APPEND again..Just comment the append ..
III_YMMM_TBL74[] = II_YMMM_TBL74[].
*<b>append III_YMMM_TBL74[].</b>
Thanks,
Naren