How to store variable length of data in data dictionary table

hi friends
    i want to store variable length of text in one of field of table which is created in data dictionary.
    i tried it by declaring table field type as string,
include that table using table statement and try to insert data in abap program . but it gives error something
"cannot use table having deep structure " i don't remember it exactly.
      can you help me how to insert variable length of data in text data dictionary table.

Hi,
    define field with type LRAW in your table to store
    string more than 255 characters.
      LRAW
Uninterpreted byte string of arbitrary length, but with a minimum
      length of 256. Fields of this type must be located at the end of
      tables and must be preceded by a length field of type INT2. LRAW
      fields cannot be used in the WHERE condition. LRAW is functional from
      Release 3.0.
Regards
amole

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