How to Generate Serial Numbers Automatically in Reports AX 2009?

Hi,

I want to generate SNO  Automatically in Reports.

Ex:

In SalesOrder  I am picking Items.

Every Item takes 1,2,3... etc Sequential Numbers.

S.No      ItemName     Qty          Price

...................................................................

1            TV                    2              10000

2

3

4

Please Help Me how to generate these sequential numbers in Reports AX 2009.

Thanks,

Balu