Thanks for your response.
A transaction type (INV) is already defined in AR. This is what is assigned to an existing organization. I set up a new org and am trying to create a new order type for this org.
Here is what I am doing:
1) In order Management--Setup , created a new Transaction Type (New_Line). Transaction Type Code is Line, order Category is Order. The Sales Document Type defaulted to 'Sales Order'
2) Then i defined a Transaction Type (New_Order) and assigned the Line Flow (order type --->New_Order, Line Type-->New_Line, Process Name ->Line Flow - Generic)
I am running into two issues.
1) Can't assign the Invoice Source to the New Line Type I just defined; and
2) When I book an order, I get "No workflow assigned ..." Error.
Am I missing anything,