I have tried doing metadata export without sharing from 2.27 and importing into 2.27, just the OU hierarchy and levels.
Importing into a clean instance gives this: INFO 2018-01-11 20:16:06,750 [Level: INFO, category: METADATA_IMPORT, time: Thu Jan 11 20:16:06 CET 2018, message: (admin) Creating 8 object(s) of type OrganisationUnitLevel] (InMemoryNotifier.java [taskScheduler-4]) * ERROR 2018-01-11 20:16:07,764 Unexpected error occurred in scheduled task. (TaskUtils.java [taskScheduler-4]) org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: org.hisp.dhis.organisationunit.OrganisationUnit at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:279) at org.hibernate.type.EntityType.getIdentifier(EntityType.java:462) at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:281) at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:291) at org.hibernate.type.TypeHelper.findDirty(TypeHelper.java:322) at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:4204) at org.hibernate.event.internal.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:528) at org.hibernate.event.internal.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:215) at org.hibernate.event.internal.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:142) at org.hibernate.event.internal.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:216) at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:85) at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:38) at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1295) at org.hisp.dhis.dbms.HibernateDbmsManager.clearSession(HibernateDbmsManager.java:339) at org.hisp.dhis.dxf2.metadata.objectbundle.DefaultObjectBundleService.commit(DefaultObjectBundleService.java:180) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) at com.sun.proxy.$Proxy189.commit(Unknown Source) at org.hisp.dhis.dxf2.metadata.DefaultMetadataImportService.importMetadata(DefaultMetadataImportService.java:127) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) at com.sun.proxy.$Proxy191.importMetadata(Unknown Source) at org.hisp.dhis.importexport.action.util.ImportMetaDataTask.call(ImportMetaDataTask.java:99) at org.hisp.dhis.security.SecurityContextRunnable.run(SecurityContextRunnable.java:57) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)
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