Define structure with table type fields using keyword "TYPES"

Question

Hi Gurus,
Using keyword "TYPES", I want to define a structure in which there is a field must be table type. It seems not allowed. For example:
    TYPES tt_items TYPE TABLE OF sflight.
    TYPES: BEGIN OF str,
      field1 TYPE i,
      field_tabl TYPE tt_items.
    TYPES:  END OF str.
Then I got a syntax error:
"TT_ITEMS" is a generic type. Use of this type is only possible for     typing field symbols and formal parameters. -     
What should I do if I want to have a table type field in it?
Thanks a lot.

Answer 1

include type EKKO includes the whole strucutre of EKKO.
if you see the structure in debug mode, it_ekko contains the fields of EKKO as well as the field CHK of type C.
In your case you can do this
TYPES: BEGIN OF str.
INCLUDE TYPE sflight.  " includes whole structure of SFLIGHT
TYPES : field1 TYPE i. " include the field1 of type I
TYPES: END OF str.
DATA : it_str TYPE TABLE OF str, " internal table
       is_str TYPE str.          " work area
Regards
Gopi