The server behaviors will not show if you hand edit the code... so the line you said you changed is also the reason it doesn't show.
To get the new orders to insert, change the code back so that you can open the server behavior.
Then open the Store Cart Summary in Database server behavior and find the value for the Save As field. That is the session variable name where the order id is stored. If you add that to the list of server behaviors to remove it will add second orders placed in the same session.