diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/ElementManagement.java b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/ElementManagement.java
index 5cd8f6c..5a4bb42 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/ElementManagement.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/ElementManagement.java
@@ -396,8 +396,8 @@ public abstract class ElementManagement<El extends OElement, T extends Type> {
 			
 			objectNode.put(Element.TYPE_PROPERTY, getTypeName());
 			
-			Collection<String> superClasses = getCachedType().getSuperTypes();
-			ArrayNode arrayNode = objectMapper.valueToTree(superClasses);
+			Collection<String> supertypes = getCachedType().getSuperTypes();
+			ArrayNode arrayNode = objectMapper.valueToTree(supertypes);
 			objectNode.replace(Element.SUPERTYPES_PROPERTY, arrayNode);
 			
 			
diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/utils/MetadataOrient.java b/src/main/java/org/gcube/informationsystem/resourceregistry/utils/MetadataOrient.java
index c2bb2c1..0a860ab 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/utils/MetadataOrient.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/utils/MetadataOrient.java
@@ -1,9 +1,16 @@
 package org.gcube.informationsystem.resourceregistry.utils;
 
+import java.util.ArrayList;
 import java.util.Date;
+import java.util.List;
 import java.util.Map;
 
+import org.gcube.informationsystem.base.reference.properties.PropertyElement;
 import org.gcube.informationsystem.model.reference.properties.Metadata;
+import org.gcube.informationsystem.model.reference.properties.Property;
+import org.gcube.informationsystem.resourceregistry.types.CachedType;
+import org.gcube.informationsystem.resourceregistry.types.TypesCache;
+import org.gcube.informationsystem.types.reference.properties.PropertyType;
 import org.gcube.informationsystem.utils.TypeUtility;
 
 import com.orientechnologies.orient.core.record.impl.ODocument;
@@ -21,6 +28,25 @@ public class MetadataOrient extends ODocument implements Metadata {
 		super(iClassName);
 	}
 	
+	@Override
+	public String getTypeName() {
+		return TypeUtility.getTypeName(this.getClass());
+	}
+
+	@Override
+	public List<String> getSupertypes() {
+		TypesCache typesCache = TypesCache.getInstance();
+		@SuppressWarnings("unchecked")
+		CachedType<PropertyType<PropertyElement>> cachedType = (CachedType<PropertyType<PropertyElement>>) typesCache.getCachedType(getTypeName());
+		try {
+			return cachedType.getSuperTypes();
+		} catch (Exception e) {
+			List<String> list = new ArrayList<>();
+			list.add(TypeUtility.getTypeName(Property.class));
+			return list;
+		}
+	}
+	
 	@Override
 	public String getCreatedBy() {
 		return this.field(Metadata.CREATED_BY_PROPERTY);
@@ -86,9 +112,4 @@ public class MetadataOrient extends ODocument implements Metadata {
 		return ret;
 	}
 	
-	@Override
-	public String getTypeName() {
-		return TypeUtility.getTypeName(this.getClass());
-	}
-	
 }
diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/utils/PropagationConstraintOrient.java b/src/main/java/org/gcube/informationsystem/resourceregistry/utils/PropagationConstraintOrient.java
index 77dfd07..121ccd4 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/utils/PropagationConstraintOrient.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/utils/PropagationConstraintOrient.java
@@ -1,8 +1,15 @@
 package org.gcube.informationsystem.resourceregistry.utils;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 
+import org.gcube.informationsystem.base.reference.properties.PropertyElement;
 import org.gcube.informationsystem.model.reference.properties.PropagationConstraint;
+import org.gcube.informationsystem.model.reference.properties.Property;
+import org.gcube.informationsystem.resourceregistry.types.CachedType;
+import org.gcube.informationsystem.resourceregistry.types.TypesCache;
+import org.gcube.informationsystem.types.reference.properties.PropertyType;
 import org.gcube.informationsystem.utils.TypeUtility;
 
 import com.orientechnologies.orient.core.record.impl.ODocument;
@@ -10,7 +17,7 @@ import com.orientechnologies.orient.core.record.impl.ODocument;
 /**
  * @author Luca Frosini (ISTI - CNR)
  */
-public class PropagationConstraintOrient extends ODocument implements org.gcube.informationsystem.model.reference.properties.PropagationConstraint {
+public class PropagationConstraintOrient extends ODocument implements PropagationConstraint {
 	
 	public PropagationConstraintOrient() {
 		super(PropagationConstraint.NAME);
@@ -19,7 +26,36 @@ public class PropagationConstraintOrient extends ODocument implements org.gcube.
 	protected PropagationConstraintOrient(String iClassName) {
 		super(iClassName);
 	}
+	
+	@Override
+	public String getTypeName() {
+		return TypeUtility.getTypeName(this.getClass());
+	}
+	
+	@Override
+	public List<String> getSupertypes() {
+		TypesCache typesCache = TypesCache.getInstance();
+		@SuppressWarnings("unchecked")
+		CachedType<PropertyType<PropertyElement>> cachedType = (CachedType<PropertyType<PropertyElement>>) typesCache.getCachedType(getTypeName());
+		try {
+			return cachedType.getSuperTypes();
+		} catch (Exception e) {
+			List<String> list = new ArrayList<>();
+			list.add(TypeUtility.getTypeName(Property.class));
+			return list;
+		}
+	}
 
+	@Override
+	public AddConstraint getAddConstraint() {
+		return AddConstraint.valueOf((String) this.field(PropagationConstraint.ADD_PROPERTY));
+	}
+
+	@Override
+	public void setAddConstraint(AddConstraint addConstraint) {
+		this.field(PropagationConstraint.ADD_PROPERTY, addConstraint.name());
+	}
+	
 	@Override
 	public DeleteConstraint getDeleteConstraint() {
 		return DeleteConstraint.valueOf((String) this.field(PropagationConstraint.DELETE_PROPERTY));
@@ -40,16 +76,6 @@ public class PropagationConstraintOrient extends ODocument implements org.gcube.
 		this.field(PropagationConstraint.REMOVE_PROPERTY, removeConstraint.name());
 	}
 
-	@Override
-	public AddConstraint getAddConstraint() {
-		return AddConstraint.valueOf((String) this.field(PropagationConstraint.ADD_PROPERTY));
-	}
-
-	@Override
-	public void setAddConstraint(AddConstraint addConstraint) {
-		this.field(PropagationConstraint.ADD_PROPERTY, addConstraint.name());
-	}
-
 	@Override
 	public Map<String, Object> getAdditionalProperties() {
 		return null;
@@ -77,9 +103,4 @@ public class PropagationConstraintOrient extends ODocument implements org.gcube.
 		return ret;
 	}
 	
-	@Override
-	public String getTypeName() {
-		return TypeUtility.getTypeName(this.getClass());
-	}
-	
 }