diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/custom_annotations/Group.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/custom_annotations/Group.java
index 508eb3e..7f4205a 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/custom_annotations/Group.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/custom_annotations/Group.java
@@ -13,4 +13,6 @@ import java.lang.annotation.Target;
 @Target({ElementType.FIELD, ElementType.TYPE})
 public @interface Group {
 	
+	Class parentGroup() default Class.class;
+	
 }
diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java
index 1e84fe9..c85f7e4 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/HelperMethods.java
@@ -187,6 +187,14 @@ public abstract class HelperMethods {
 							if(!groups.contains(groupName))
 								groups.add(groupName);
 							
+							// check if this class has a father too (@Group annotation allows it)
+							Group groupAnnotationOnEnum = field.getType().getAnnotation(Group.class);
+							if(!groupAnnotationOnEnum.parentGroup().equals(Class.class)){
+								String groupNameFather = getGroupNameOnCkan(groupAnnotationOnEnum.parentGroup().getSimpleName());
+								if(!groups.contains(groupNameFather))
+									groups.add(groupNameFather);
+							}
+							
 						}
 						
 					}catch(Exception e){
diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Abundance_Level.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Abundance_Level.java
index 2cced6b..28f2d5b 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Abundance_Level.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Abundance_Level.java
@@ -9,7 +9,7 @@ import com.fasterxml.jackson.annotation.JsonValue;
  * Abundance_Level for Stock records
  * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
  */
-@Group
+@Group(parentGroup=Indicator.class)
 public enum Abundance_Level {
 
 	Intermediate_Abundance("Intermediate abundance"),
diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Exploitation_Rate.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Exploitation_Rate.java
index b452176..876af4c 100644
--- a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Exploitation_Rate.java
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Exploitation_Rate.java
@@ -8,7 +8,7 @@ import com.fasterxml.jackson.annotation.JsonCreator;
  * Exploitation_Rate for Stock records
  * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
  */
-@Group
+@Group(parentGroup=Indicator.class)
 public enum Exploitation_Rate {
 
 	Moderate_Fishing_Mortality("Moderate fishing mortality"),
diff --git a/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Indicator.java b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Indicator.java
new file mode 100644
index 0000000..63797a1
--- /dev/null
+++ b/src/main/java/org/gcube/data_catalogue/grsf_publish_ws/utils/groups/Indicator.java
@@ -0,0 +1,12 @@
+package org.gcube.data_catalogue.grsf_publish_ws.utils.groups;
+
+import org.gcube.data_catalogue.grsf_publish_ws.custom_annotations.Group;
+
+/**
+ * Indicator group: father of Abundance level and Exploitation Rate
+ * @author Costantino Perciante at ISTI-CNR (costantino.perciante@isti.cnr.it)
+ */
+@Group
+public enum Indicator {
+
+}