[otrs] Customer answer subject

Hi, Sorry for sending the same message I used Otrs v-2.0, into the customer interface when answering to support message the subject of the message was inserted automatically and contain the same one as the ticket subjet on its creation. While upgraded to version 2.2.3 the subject is always blank, I would to know how to do to let automatically the ticket's creation subject Can somebody help me please ? Thank you