User exit Or Badi for creating Service order while modifying sales order.

Hi Experts,

I am creating Notification using transaction IW51.

In IW51 there is a button to create a sales order.

I click on sales order button and create a sales order.

Now notification and sales order are created.

Now i go in transaction VA02 and click on avalibility check push button .It gives me some popups in which i select copy all options.Then i click on save button

.At this point service order gets created.

My requirement :

Before the service order gets created i want to pass the notification data ; for ex- Equnr(Equipment number) to service order.

Thanks & Regards,

Chetan