If EAP 7 is started then there is logged warning like:

13:03:30,260 WARN  [org.jboss.as.txn] (ServerService Thread Pool -- 70) WFLYTX0013: Node identifier property is set to the default value. Please make sure it is unique.

There should be provided information what it means for example by providing link to documentation and how to configure it in CLI. node-identifier can be set in CLI using:
/subsystem=transactions:write-attribute(name=node-identifier,value=unique-value) command