diff --git a/src/main/java/org/gcube/informationsystem/types/impl/properties/PropertyTypeImpl.java b/src/main/java/org/gcube/informationsystem/types/impl/properties/PropertyTypeImpl.java
index 7b6ad66..adb74bf 100644
--- a/src/main/java/org/gcube/informationsystem/types/impl/properties/PropertyTypeImpl.java
+++ b/src/main/java/org/gcube/informationsystem/types/impl/properties/PropertyTypeImpl.java
@@ -8,8 +8,6 @@ import org.gcube.com.fasterxml.jackson.annotation.JsonIgnore;
 import org.gcube.com.fasterxml.jackson.annotation.JsonTypeName;
 import org.gcube.informationsystem.base.reference.AccessType;
 import org.gcube.informationsystem.base.reference.properties.PropertyElement;
-import org.gcube.informationsystem.model.reference.properties.Attribute;
-import org.gcube.informationsystem.model.reference.properties.AttributeDefinition;
 import org.gcube.informationsystem.queries.templates.reference.properties.TemplateVariable;
 import org.gcube.informationsystem.serialization.ElementMapper;
 import org.gcube.informationsystem.types.impl.TypeImpl;
@@ -36,8 +34,6 @@ public final class PropertyTypeImpl<P extends PropertyElement> extends TypeImpl
 	static {
 		propertyElementAccesTypes = new HashSet<>();
 		propertyElementAccesTypes.add(PropertyElement.NAME);
-		propertyElementAccesTypes.add(Attribute.NAME);
-		propertyElementAccesTypes.add(AttributeDefinition.NAME);
 		propertyElementAccesTypes.add(LinkedEntity.NAME);
 		propertyElementAccesTypes.add(TemplateVariable.NAME);
 	}