diff --git a/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeries.java b/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeries.java
index 20f3fcb..449dd2d 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeries.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeries.java
@@ -16,6 +16,8 @@ import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
+import javax.persistence.NamedQueries;
+import javax.persistence.NamedQuery;
 import javax.persistence.Table;
 
 import static org.scientificcms.publications.SciPublicationsConstants.*;
@@ -32,6 +34,12 @@ import static org.scientificcms.publications.SciPublicationsConstants.*;
     property = "uuid",
     scope = VolumeInSeries.class
 )
+@NamedQueries({
+    @NamedQuery(
+        name = "VolumeInSeries",
+        query = "SELECT v FROM VolumeInSeries v WHERE v.uuid = :uuid"
+    )
+})
 public class VolumeInSeries implements Exportable, Serializable {
 
     private static final long serialVersionUID = 1L;
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeriesImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeriesImExporter.java
index 06d0ade..a791862 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeriesImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/VolumeInSeriesImExporter.java
@@ -16,6 +16,7 @@ import org.scientificcms.publications.contenttypes.TalkItem;
 import org.scientificcms.publications.contenttypes.WorkingPaperItem;
 
 import java.util.Objects;
+import java.util.Optional;
 import java.util.Set;
 
 import javax.annotation.PostConstruct;
@@ -23,7 +24,6 @@ import javax.enterprise.context.RequestScoped;
 import javax.inject.Inject;
 import javax.persistence.EntityManager;
 import javax.persistence.NoResultException;
-import javax.transaction.Transactional;
 
 /**
  *
@@ -64,19 +64,52 @@ public class VolumeInSeriesImExporter
     }
 
     @Override
-    @Transactional(Transactional.TxType.REQUIRED)
+    protected Optional<VolumeInSeries> findExistingEntity(final String uuid) {
+        try {
+            return Optional.of(
+                entityManager
+                    .createNamedQuery(
+                        "VolumeInSeries.findByUuid",
+                        VolumeInSeries.class
+                    )
+                    .setParameter("uuid", uuid)
+                    .getSingleResult()
+            );
+        } catch (NoResultException ex) {
+            return Optional.empty();
+        }
+    }
+
+    @Override
     protected void saveImportedEntity(final VolumeInSeries entity) {
         entityManager.merge(entity);
     }
+    
+    @Override
+    protected void updateExistingEntity(
+        final VolumeInSeries existingEntity,
+        final VolumeInSeries importedEntity
+    ) {
+        if (!Objects.equals(
+            existingEntity.getVolumeOfSeries(),
+            importedEntity.getVolumeOfSeries()
+        )) {
+            existingEntity.setVolumeOfSeries(
+                importedEntity.getVolumeOfSeries()
+            );
+        }
+        
+        entityManager.merge(existingEntity);
+    }
 
     @Override
     protected VolumeInSeries reloadEntity(final VolumeInSeries entity) {
         try {
             return entityManager.find(
-                VolumeInSeries.class, 
+                VolumeInSeries.class,
                 entity.getVolumeId()
             );
-        } catch(NoResultException ex) {
+        } catch (NoResultException ex) {
             throw new IllegalArgumentException(
                 String.format(
                     "The VolumeInSeries entity %s was not found in "