Delete Statement

i have a code like below

DELETE lt_cddetails WHERE tabname EQ 'KONDAT' AND

                                  ( f_old EQ '00.00.000'  OR chngind EQ 'I' )

  If this internal table contains f_old as 00/00/0000 it is not deleting that entry. Is there any way to delete this for all null values ? ( other than adding all possible formats in OR condition ?

Regards,

Praveen