Shipping type determination in sales order

Hi,

I want to populate the shipping type (VBKD-VSART) and means of transport type field (VBKD-TRATY) for a specific line item in a sales order.

But I do not want to define the shipping type via the route...is there anyone that knows how to populate those 2 fields automatically? User exit/BADI? Config in IMG?

//Lars