Well, I think its a design decision that you will have to take. If you plan to save unpaid itineraries, then you will have to do it in Prepare itinerary UC. If you are saving only paid itineraries, then it can be done after the payment has taken place (Pay Itinerary UC).
SCJP 1.4, SCWCD 1.4, SCBCD 1.3, SCEA
Always! Wait. Never. Shut up. Look at this tiny ad.