About unpaid Itineraries

[Marta De rossi]

Hi all !
I have read a topic about Unpaid itineraries a few days ago.
I have decided to give a leased lock to the seat allowing the user
to reserve a seat within 30 minutes. After that time the seat lock will be released if it's unpaid.
My question is: with this design in mind, there can be multi-user access of Seats EJB PK (SeatIdPK) ?
If so, then I have to implement Seats EJB as Entity Bean.....

at the moment I'm only using Session Beans in my project.

Should I modify my design if favour of Entity Beans ?
Thanks
Marta