Error when committing an object inside a Java action

I get the following error from mendix when I (believe) I am trying to commit an object in a java action that has been invoked by the system instead of a user.

com.mendix.systemwideinterfaces.MendixRuntimeException: Autocommitted objects detected at end of transaction for system session for entities:
 - x.EmailMessage: 1 instances
	at com.mendix.basis.action.RequestScope$$anonfun$com$mendix$basis$action$RequestScope$$verifyNoAutoCommitsForSystemSessionExists$1$1.apply(RequestScope.scala:117)
	at com.mendix.basis.action.RequestScope$$anonfun$com$mendix$basis$action$RequestScope$$verifyNoAutoCommitsForSystemSessionExists$1$1.apply(RequestScope.scala:115)
	at scala.Option.foreach(Option.scala:257)
	at com.mendix.basis.action.RequestScope.com$mendix$basis$action$RequestScope$$verifyNoAutoCommitsForSystemSessionExists$1(RequestScope.scala:115)
	at com.mendix.basis.action.RequestScope$$anonfun$endTransaction$1.apply(RequestScope.scala:131)
	at com.mendix.basis.action.RequestScope$$anonfun$endTransaction$1.apply(RequestScope.scala:128)
	at scala.Option.foreach(Option.scala:257)
	at com.mendix.basis.action.RequestScope.endTransaction(RequestScope.scala:128)
	at com.mendix.basis.action.ContextImpl.endTransaction(ContextImpl.java:204)
	at com.mendix.basis.component.InternalCore.commit(InternalCore.java:321)
	at com.mendix.basis.component.InternalCore.commit(InternalCore.java:188)
	at com.mendix.basis.component.InternalCore.commit(InternalCore.java:166)
	at com.mendix.basis.component.InternalCore.commit(InternalCore.java:152)
	at com.mendix.basis.actionmanagement.UserScheduledAction.executeScheduledAction(ScheduledAction.scala:86)
	at com.mendix.basis.actionmanagement.ScheduledAction$ScheduledRun$$anonfun$run$1.apply(ScheduledAction.scala:141)
	at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47)
	at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:33)
	at com.mendix.basis.actionmanagement.IMonitoredAction$class.monitor(IMonitoredAction.scala:49)
	at com.mendix.basis.actionmanagement.ScheduledAction$ScheduledRun.monitor(ScheduledAction.scala:132)
	at com.mendix.basis.actionmanagement.ScheduledAction$ScheduledRun.run(ScheduledAction.scala:141)
	at com.mendix.basis.actionmanagement.ScheduledAction.execute(ScheduledAction.scala:130)
	at com.mendix.basis.actionmanagement.ScheduledAction.run(ScheduledAction.scala:111)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

Any thoughts of sorting this out? Can I assign a session/user to the object even though the system itself is using the microflow?