diff --git a/src/main/java/org/gcube/informationsystem/model/embedded/Header.java b/src/main/java/org/gcube/informationsystem/model/embedded/Header.java
index 6c6d90f..0a8717a 100644
--- a/src/main/java/org/gcube/informationsystem/model/embedded/Header.java
+++ b/src/main/java/org/gcube/informationsystem/model/embedded/Header.java
@@ -11,13 +11,13 @@ import org.gcube.informationsystem.model.annotations.ISProperty;
  */
 public interface Header extends Embedded {
 	
-	@ISProperty
+	@ISProperty(readonly=true)
 	public String getID();
 	
-	@ISProperty
+	@ISProperty(readonly=true)
 	public String getCreator();
 	
-	@ISProperty
+	@ISProperty(readonly=true)
 	public Long getCreationTime();
 	
 	@ISProperty
diff --git a/src/test/java/org/gcube/informationsystem/types/EntitySchemaDefinition.java b/src/test/java/org/gcube/informationsystem/types/EntitySchemaDefinition.java
index 5eb27d5..68833b3 100644
--- a/src/test/java/org/gcube/informationsystem/types/EntitySchemaDefinition.java
+++ b/src/test/java/org/gcube/informationsystem/types/EntitySchemaDefinition.java
@@ -6,7 +6,7 @@ package org.gcube.informationsystem.types;
 import java.lang.reflect.Field;
 
 import org.gcube.informationsystem.model.annotations.Abstract;
-import org.gcube.informationsystem.model.embedded.RelationProperty;
+import org.gcube.informationsystem.model.embedded.Header;
 import org.gcube.informationsystem.types.TypeBinder.TypeDefinition;
 import org.junit.Test;
 import org.slf4j.Logger;
@@ -60,7 +60,7 @@ public class EntitySchemaDefinition {
 	
 	@Test
 	public void test() throws Exception {
-		Class<?> clz = RelationProperty.class;
+		Class<?> clz = Header.class;
 		String json = TypeBinder.serializeType(clz);
 		logger.trace(json);
 	}