diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInCollectedVolumeItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInCollectedVolumeItemImExporter.java
index fa04263..676a4eb 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInCollectedVolumeItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInCollectedVolumeItemImExporter.java
@@ -14,7 +14,8 @@ import javax.enterprise.context.RequestScoped;
  */
 @RequestScoped
 @Processes(ArticleInCollectedVolumeItem.class)
-public class ArticleInCollectedVolumeItemImExporter extends AbstractContentItemImExporter<ArticleInCollectedVolumeItem> {
+public class ArticleInCollectedVolumeItemImExporter
+    extends AbstractContentItemImExporter<ArticleInCollectedVolumeItem> {
 
     @Override
     protected void initContentItemImExporter() {
@@ -26,4 +27,12 @@ public class ArticleInCollectedVolumeItemImExporter extends AbstractContentItemI
         return ArticleInCollectedVolumeItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final ArticleInCollectedVolumeItem existingItem,
+        final ArticleInCollectedVolumeItem importedItem
+    ) {
+        // Nothing to update in ArticleInCollectedVolumeItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInJournalItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInJournalItemImExporter.java
index 197ae8c..777d5d3 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInJournalItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ArticleInJournalItemImExporter.java
@@ -27,4 +27,12 @@ public class ArticleInJournalItemImExporter
         return ArticleInJournalItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final ArticleInJournalItem existingItem,
+        final ArticleInJournalItem importedItem
+    ) {
+        // Nothing to update in ArticleInJournalItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/CollectedVolumeItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/CollectedVolumeItemImExporter.java
index 1b9d311..130f20a 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/CollectedVolumeItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/CollectedVolumeItemImExporter.java
@@ -27,4 +27,12 @@ public class CollectedVolumeItemImExporter
         return CollectedVolumeItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final CollectedVolumeItem existingItem,
+        final CollectedVolumeItem importedItem
+    ) {
+        // Nothing to update in CollectedVolumeItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ExpertiseItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ExpertiseItemImExporter.java
index 0e9e88c..389a8c6 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ExpertiseItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ExpertiseItemImExporter.java
@@ -27,4 +27,12 @@ public class ExpertiseItemImExporter
         return ExpertiseItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final ExpertiseItem existingItem,
+        final ExpertiseItem importedItem
+    ) {
+        // Nothing to update in ExpertiseItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/GreyLiteratureItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/GreyLiteratureItemImExporter.java
index 41ed6b5..4d7268f 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/GreyLiteratureItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/GreyLiteratureItemImExporter.java
@@ -27,4 +27,12 @@ public class GreyLiteratureItemImExporter
         return GreyLiteratureItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final GreyLiteratureItem existingItem,
+        final GreyLiteratureItem importedItem
+    ) {
+        // Nothing to update in GreyLiteratureItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InProceedingsItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InProceedingsItemImExporter.java
index 27bc1b7..e0dc263 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InProceedingsItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InProceedingsItemImExporter.java
@@ -27,4 +27,12 @@ public class InProceedingsItemImExporter
         return InProceedingsItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final InProceedingsItem existingItem,
+        final InProceedingsItem importedItem
+    ) {
+        // Nothing to update in InProceedingsItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InternetArticleItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InternetArticleItemImExporter.java
index 82b3de7..50f8d50 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InternetArticleItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/InternetArticleItemImExporter.java
@@ -16,15 +16,23 @@ import javax.enterprise.context.RequestScoped;
 @Processes(InternetArticleItem.class)
 public class InternetArticleItemImExporter
     extends AbstractContentItemImExporter<InternetArticleItem> {
-    
+
     @Override
     protected void initContentItemImExporter() {
         addRequiredEntities(Set.of(InternetArticle.class));
     }
-    
+
     @Override
     public Class<InternetArticleItem> getEntityClass() {
         return InternetArticleItem.class;
     }
-    
+
+    @Override
+    protected void updateExistingContentItem(
+        final InternetArticleItem existingItem,
+        final InternetArticleItem importedItem
+    ) {
+        // Nothing to update in InternetArticleItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/MonographItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/MonographItemImExporter.java
index ac0c754..9f74fba 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/MonographItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/MonographItemImExporter.java
@@ -3,7 +3,6 @@ package org.scientificcms.publications.contenttypes;
 import org.libreccm.imexport.Processes;
 import org.librecms.contentsection.AbstractContentItemImExporter;
 import org.scientificcms.publications.Monograph;
-import org.scientificcms.publications.assets.PublisherAsset;
 
 import java.util.Set;
 
@@ -28,4 +27,12 @@ public class MonographItemImExporter
         return MonographItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final MonographItem existingItem, 
+        final MonographItem importedItem
+    ) {
+        // Nothing to update in MonographItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ProceedingsItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ProceedingsItemImExporter.java
index 94d94b5..ba06f11 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ProceedingsItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/ProceedingsItemImExporter.java
@@ -27,4 +27,12 @@ public class ProceedingsItemImExporter
         return ProceedingsItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final ProceedingsItem existingItem,
+        final ProceedingsItem importedItem
+    ) {
+        // Nothing to update in ProceedingsItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/TalkItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/TalkItemImExporter.java
index 2d679b0..e7cf70d 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/TalkItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/TalkItemImExporter.java
@@ -27,4 +27,12 @@ public class TalkItemImExporter
         addRequiredEntities(Set.of(Talk.class));
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final TalkItem existingItem, 
+        final TalkItem importedItem
+    ) {
+        // Nothing to update in TalkItem
+    }
+
 }
diff --git a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/WorkingPaperItemImExporter.java b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/WorkingPaperItemImExporter.java
index b5c44e6..d1b32ac 100644
--- a/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/WorkingPaperItemImExporter.java
+++ b/sci-publications/src/main/java/org/scientificcms/publications/contenttypes/WorkingPaperItemImExporter.java
@@ -27,4 +27,12 @@ public class WorkingPaperItemImExporter
         return WorkingPaperItem.class;
     }
 
+    @Override
+    protected void updateExistingContentItem(
+        final WorkingPaperItem existingItem,
+        final WorkingPaperItem importedItem
+    ) {
+        // Nothing to update in WorkingPaperItem
+    }
+
 }