The following is the reported stack trace: -

10:59:51,286 ERROR [org.jboss.as.controller] operation ("add") failed - address: ([("subsystem" => "transactions")]): java.util.NoSuchElementException: No child 'process-id' exists
at org.jboss.dmr.ModelValue.requireChild(ModelValue.java:362)
at org.jboss.dmr.ModelNode.require(ModelNode.java:703)
at org.jboss.as.txn.TransactionSubsystemAdd.execute(TransactionSubsystemAdd.java:83)
at org.jboss.as.controller.BasicModelController.doExecute(BasicModelController.java:403)
at org.jboss.as.server.ServerControllerImpl.doExecute(ServerControllerImpl.java:189) [jboss-as-server-7.0.0.Beta4-SNAPSHOT.jar:7.0.0.Beta4-SNAPSHOT]
at org.jboss.as.controller.BasicModelController.execute(BasicModelController.java:275)
at org.jboss.as.controller.BasicModelController.execute(BasicModelController.java:231)
at org.jboss.as.controller.BasicModelController.execute(BasicModelController.java:80)
at org.jboss.as.controller.AbstractModelController.execute(AbstractModelController.java:46)
at org.jboss.as.server.ServerControllerService.start(ServerControllerService.java:187) [jboss-as-server-7.0.0.Beta4-SNAPSHOT.jar:7.0.0.Beta4-SNAPSHOT]
at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1675) [jboss-msc-1.0.0.Beta8.jar:1.0.0.Beta8]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_24]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_24]
at java.lang.Thread.run(Thread.java:662) [:1.6.0_24]

If there is a problem with the XML this should really be picked up before the operations are executed during the XML parsing.