usage of "Common part"

Hello All,

I need to declare a internal table with header line in a common part area ( Begin of common part), so that it can be used by more than one program of a program group.

The table structure is :

DATA : BEGIN OF i_msg OCCURS 0,

aenam LIKE zvs21-aenam,

langu LIKE zvs21-langu,

vbeln LIKE zvs21-vbeln.

INCLUDE STRUCTURE message.

DATA : END OF i_msg.

Kindly let me know how can i go abt this ?

Thanks in advance,

Sharat