[otrs] Sequence of notifications for e-mail ticket

Hi all, I have a event based notification for when a ticket has been locked by an agent, which informs the customer who is dealing with their issue. If I create a ticket using the E-mail Ticket form and assign an agent to it, the customer will receive two e-mails in this order: 1. Ticket has been assigned 2. Ticket has been created. Obviously I would like this the other way round, does anyone know how to do this? Thanks, David