HOW CAN I PASS A DEFAULT VALUE IN INTERNAL TABLE

HOW CAN I PASS A DEFAULT VALUE IN INTERNAL TABLE.
DATA : BEGIN OF ITAB OCCURS 0,
           FIELD1(2) TYPC C DEFAULT   '12',
           FIELD2     TYPE C ,
           END OF ITAB1.
IT'S GIVING ERROR MESSAGE.
PLZ LOOK INTO THIS AND GIVE ME CORRECT SOLUTION.
THANKS
SURI

DATA : BEGIN OF ITAB OCCURS 0,
FIELD1(2) TYPC C,
FIELD2 TYPE C ,
END OF ITAB1.
itab-field1 = '12'.
itab-field2 = 'A'.
append itab.
clear itab-field2.
itab-field1 = '12'.
itab-field2 = 'B'.
append itab.
clear itab-field2.
Now everytime u'll have the value for field1 = '12'.
Regards
Vasu

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Aman wrote:
while trying to add column to compressed table with default value i am getting error.This is clearly explain in the Oracle doc :
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