To increment the value of a text symbol?

Hi SAP-Techies....

Need ur help in printng form.

(script-Rvorder01.)

To display Row1-item,matnr,price,qty,total.

Row2-Description,Bed,Ecs,Vat.

requirements:

1)To give/print index(serial no)to the records appearing in the main window.

I tried to define a text-symbol(&sapscript-counter_0&) and initialized it globally.placed it in text-element item_line ( as &sascript-counter_0(+)& )but... its not working.(its displaying same initailized value for all the records).

I hope I'm clear with my query.

Your valuable suggestions would be appriciated.

Regards...

Meraj.