When you have set the object store to be type of hornetq and then you change your mind to set it for jdbc object store the jboss-cli permits this operation but no change is propagated to model and XML file.

How to reproduce:

1. ./bin/standalone.xml (start eap 6.2.0.GA)
2. ./bin/jboss-cli.sh -c (connect to running eap)
3. /subsystem=transactions:write-attribute(name=use-hornetq-store, value=true)
4. :reload
5. /subsystem=transactions/log-store=log-store:read-attribute(name=type)
6. /subsystem=transactions:write-attribute(name=use-jdbc-store, value=true)
7. :reload
8. /subsystem=transactions/log-store=log-store:read-attribute(name=type)

The object store stays to be set to hornetq and no change happens in the standalone.xml file.