diff --git a/ccm-docrepo/src/main/java/org/libreccm/docrepo/BlobObjectImExporter.java b/ccm-docrepo/src/main/java/org/libreccm/docrepo/BlobObjectImExporter.java
index c7480d6f3..2c83abcf2 100644
--- a/ccm-docrepo/src/main/java/org/libreccm/docrepo/BlobObjectImExporter.java
+++ b/ccm-docrepo/src/main/java/org/libreccm/docrepo/BlobObjectImExporter.java
@@ -19,19 +19,23 @@
 package org.libreccm.docrepo;
 
 import org.libreccm.imexport.AbstractEntityImExporter;
+import org.libreccm.imexport.Exportable;
 import org.libreccm.imexport.Processes;
 
+import java.util.Collections;
+import java.util.Set;
+
 import javax.faces.bean.RequestScoped;
 import javax.inject.Inject;
 import javax.transaction.Transactional;
 
 /**
- * Im/Exporter for importing and exporting {@code BlobObject}s from the
- * system into a specified file and the other way around.
+ * Im/Exporter for importing and exporting {@code BlobObject}s from the system
+ * into a specified file and the other way around.
  *
  * @author <a href="mailto:tosmers@uni-bremen.de">Tobias Osmers</a>
  * @author <a href="mailto:jens.pelzetter@googlemail.com">Jens Pelzetter</a>
- * 
+ *
  */
 @RequestScoped
 @Processes(BlobObject.class)
@@ -48,7 +52,13 @@ public class BlobObjectImExporter extends AbstractEntityImExporter<BlobObject> {
     @Override
     @Transactional(Transactional.TxType.REQUIRED)
     protected void saveImportedEntity(final BlobObject entity) {
-        
+
         blobObjectRepository.save(entity);
     }
+
+    @Override
+    protected Set<Class<? extends Exportable>> getRequiredEntities() {
+        return Collections.emptySet();
+    }
+
 }
diff --git a/ccm-docrepo/src/main/java/org/libreccm/docrepo/FileImExporter.java b/ccm-docrepo/src/main/java/org/libreccm/docrepo/FileImExporter.java
index 03dbe861d..09f6112a8 100644
--- a/ccm-docrepo/src/main/java/org/libreccm/docrepo/FileImExporter.java
+++ b/ccm-docrepo/src/main/java/org/libreccm/docrepo/FileImExporter.java
@@ -19,8 +19,12 @@
 package org.libreccm.docrepo;
 
 import org.libreccm.imexport.AbstractEntityImExporter;
+import org.libreccm.imexport.Exportable;
 import org.libreccm.imexport.Processes;
 
+import java.util.Collections;
+import java.util.Set;
+
 import javax.enterprise.context.RequestScoped;
 
 
@@ -51,4 +55,11 @@ public class FileImExporter extends AbstractEntityImExporter<File> {
     protected void saveImportedEntity(final File portableObject) {
         fileRepository.save(portableObject);
     }
+
+    @Override
+    protected Set<Class<? extends Exportable>> getRequiredEntities() {
+        return Collections.emptySet();
+    }
+    
+    
 }
diff --git a/ccm-docrepo/src/main/java/org/libreccm/docrepo/FolderImExporter.java b/ccm-docrepo/src/main/java/org/libreccm/docrepo/FolderImExporter.java
index 8d9f1d391..b757b1eff 100644
--- a/ccm-docrepo/src/main/java/org/libreccm/docrepo/FolderImExporter.java
+++ b/ccm-docrepo/src/main/java/org/libreccm/docrepo/FolderImExporter.java
@@ -18,15 +18,19 @@
  */
 package org.libreccm.docrepo;
 
+import org.libreccm.imexport.Exportable;
 import org.libreccm.imexport.Processes;
 
+import java.util.Collections;
+import java.util.Set;
+
 import javax.faces.bean.RequestScoped;
 import javax.inject.Inject;
 import javax.transaction.Transactional;
 
 /**
- * Im/Exporter for importing and exporting {@link Folder}s from the
- * system into a specified file and the other way around.
+ * Im/Exporter for importing and exporting {@link Folder}s from the system into
+ * a specified file and the other way around.
  *
  * @author <a href="mailto:tosmers@uni-bremen.de">Tobias Osmers</a>
  * @author <a href="mailto:jens.pelzetter@uni-bremen.de">Jens Pelzetter</a>
@@ -48,4 +52,10 @@ public class FolderImExporter extends AbstractResourceImExporter<Folder> {
     protected void saveImportedEntity(final Folder entity) {
         folderRepository.save(entity);
     }
+
+    @Override
+    protected Set<Class<? extends Exportable>> getRequiredEntities() {
+        return Collections.emptySet();
+    }
+
 }
diff --git a/ccm-docrepo/src/main/java/org/libreccm/docrepo/RepositoryImExporter.java b/ccm-docrepo/src/main/java/org/libreccm/docrepo/RepositoryImExporter.java
index 011d3f9c0..bd2e03df2 100644
--- a/ccm-docrepo/src/main/java/org/libreccm/docrepo/RepositoryImExporter.java
+++ b/ccm-docrepo/src/main/java/org/libreccm/docrepo/RepositoryImExporter.java
@@ -19,8 +19,12 @@
 package org.libreccm.docrepo;
 
 import org.libreccm.imexport.AbstractEntityImExporter;
+import org.libreccm.imexport.Exportable;
 import org.libreccm.imexport.Processes;
 
+import java.util.Collections;
+import java.util.Set;
+
 import javax.faces.bean.RequestScoped;
 import javax.inject.Inject;
 
@@ -44,4 +48,12 @@ public class RepositoryImExporter extends AbstractEntityImExporter<Repository> {
     protected void saveImportedEntity(final Repository portableObject) {
         repositoryRepository.save(portableObject);
     }
+
+    @Override
+    protected Set<Class<? extends Exportable>> getRequiredEntities() {
+        return Collections.emptySet();
+    }
+    
+    
 }
+    
\ No newline at end of file