Hello Mauricio Salatino,
Yes i do agree with point that migration is not good idea as it is not straight forward. But running Jbpm 3.2.3 on Jboss 7 as embedded deployment may not be working as JBPM 3.2.3 uses Hibernate 3 and EJB3 services on Jboss 7 uses Hibernate 4.
Is there any chance that Jbpm 3.2.3 can work on Hibernate 4 also?