diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java
index 1f7ce8c..09b606a 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/instances/base/properties/PropertyElementManagement.java
@@ -9,6 +9,7 @@ import org.gcube.com.fasterxml.jackson.databind.ObjectMapper;
 import org.gcube.com.fasterxml.jackson.databind.node.ObjectNode;
 import org.gcube.informationsystem.base.reference.AccessType;
 import org.gcube.informationsystem.base.reference.Element;
+import org.gcube.informationsystem.base.reference.properties.PropertyElement;
 import org.gcube.informationsystem.model.impl.properties.EncryptedImpl;
 import org.gcube.informationsystem.model.reference.properties.Encrypted;
 import org.gcube.informationsystem.model.reference.properties.Header;
@@ -22,6 +23,7 @@ import org.gcube.informationsystem.resourceregistry.types.CachedType;
 import org.gcube.informationsystem.resourceregistry.types.TypesCache;
 import org.gcube.informationsystem.resourceregistry.utils.EncryptedOrient;
 import org.gcube.informationsystem.resourceregistry.utils.HeaderUtility;
+import org.gcube.informationsystem.types.reference.properties.PropertyType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -56,7 +58,8 @@ public class PropertyElementManagement {
 			
 			try {
 				TypesCache typesCache = TypesCache.getInstance();
-				CachedType cachedType = typesCache.getCachedType(type);
+				@SuppressWarnings("unchecked")
+				CachedType<PropertyType<PropertyElement>> cachedType = (CachedType<PropertyType<PropertyElement>>) typesCache.getCachedType(type);
 				oClass = cachedType.getOClass();
 				AccessType gotAccessType = cachedType.getAccessType();
 				if(!AccessType.PROPERTY_ELEMENT.getClass().isAssignableFrom(gotAccessType.getClass())) {
@@ -131,7 +134,8 @@ public class PropertyElementManagement {
 			}
 			
 			TypesCache typesCache = TypesCache.getInstance();
-			CachedType cachedType = typesCache.getCachedType(type);
+			@SuppressWarnings("unchecked")
+			CachedType<PropertyType<PropertyElement>> cachedType = (CachedType<PropertyType<PropertyElement>>) typesCache.getCachedType(type);
 			OClass oClass = cachedType.getOClass();
 			AccessType gotAccessType = cachedType.getAccessType();
 			if(!AccessType.PROPERTY_ELEMENT.getClass().isAssignableFrom(gotAccessType.getClass())) {