Append a record to internal table

Question

hello:
when i execute the code below,there is a runtime error." In die sortierte interne Tabelle (Typ SORTED_TABLE)
  "PROGRAM=ZJOIN_INTER_TABLEDATA=T_ITAB1" sollte an
Position 1 eine Zeile eingefügt bzw. geändert werden.
Dadurch wurde die für die Tabelle durch ihren Schlüssel festgelegte
Sortierreihenfolge zerstört."
how can i resolve it?which one can tell me?Thanks very much
REPORT  ZJOIN_INTER_TABLE.
DATA:BEGIN OF WA_ITAB,
        COL1 TYPE I,
        COL2(10) TYPE C,
      END OF WA_ITAB.
DATA:T_ITAB1 LIKE SORTED TABLE OF WA_ITAB WITH NON-UNIQUE KEY COL1.
WA_ITAB-COL1 = 10.
WA_ITAB-COL2 = 'col2'.
APPEND WA_ITAB TO T_ITAB1.
WA_ITAB-COL1 = 9.
WA_ITAB-COL2 = 'col2'.
APPEND WA_ITAB TO T_ITAB1.

Answer 1

hi
kindly go thro the lines.
syntax:
DATA itab {TYPE tabkind OF linetype|LIKE tabkind OF lineobj}
          WITH [UNIQUE|NON-UNIQUE] keydef
          [INITIAL SIZE n] [WITH HEADER LINE].
The system creates an internal table with table type tabkind. Since there is no generic field definition, you cannot use the table types ANY TABLE or SORTED TABLE.
The construction of the table lines is defined by linetype (if you are using a TYPE reference) or by the type of the referred object lineobj (if you are using a LIKE reference). If you specify the line type, you can also use REF TO to refer to a reference type.
The same rules apply to UNIQUE and NON-UNIQUE as apply to the TYPES definition. You may only omit this specification with standard tables.
If you do not specify an INITIAL SIZE, the system assumes a default value of INITIAL SIZE 0.
i think now u r clear... now yr code will work.
DATA:BEGIN OF WA_ITAB,
COL1 TYPE I,
COL2(10) TYPE C,
END OF WA_ITAB.
DATA:T_ITAB1 like TABLE OF WA_ITAB WITH NON-UNIQUE KEY COL1.
WA_ITAB-COL1 = 10.
WA_ITAB-COL2 = 'col2'.
APPEND WA_ITAB TO T_ITAB1.
WA_ITAB-COL1 = 9.
WA_ITAB-COL2 = 'col2'.
APPEND WA_ITAB TO T_ITAB1.