I have developped a custom driver program and a smartfor layout for sales order confirmation. And configured the program and layout against a output type.
I go to VA02
>Type an order number
Choose 'Issue output to' from Sales document menu. Then I will select the output type and press print preview button.
In this case my custom driver program is called. My question is during this run time how do I get the VBELN for the current document that I have entered? Based on this VBELN, I am going to fetch the required data.