How to declare internal table with types

Hi to all,

how to declare internal table with types,

here iam declaring internal table with types but it shows error

where i done a mistake.

tables : /bi0/pplant.

types : begin of i_plant,

plant type plant,

country type county,

region type region,

types : end of i_plant.

data : itab type table of i_plant,

wa type line of i_plant.

please reply....

thanks and regards,

swami