diff --git a/distro/changelog.xml b/distro/changelog.xml
index 758d6ca..7e4f0a1 100644
--- a/distro/changelog.xml
+++ b/distro/changelog.xml
@@ -3,6 +3,7 @@
 		date="2017-05-01">
 		<Change>Pom fixes</Change>
 		<Change>Moved to java 8</Change>
+		<Change>Added method to add a dataset to a group and its parents (if any)</Change>
 	</Changeset>
 	<Changeset component="org.gcube.data-catalogue.ckan-util-library.2-2-1"
 		date="2017-04-01">
diff --git a/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogue.java b/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogue.java
index c2706c0..ba108f9 100644
--- a/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogue.java
+++ b/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogue.java
@@ -360,6 +360,17 @@ public interface DataCatalogue {
 	 */
 	boolean assignDatasetToGroup(String groupNameOrId, String datasetNameOrId,
 			String apiKey);
+	
+	/**
+	 * Assign a dataset to a group and the group's parents (if any)
+	 * @param groupNameOrId the id or the name of the destination group.
+	 * @param datasetNameOrId the id or the name of the dataset
+	 * @param apiKey (the apiKey should belong to someone that has the role of editor/admin of the organization in which
+	 * 		  the dataset is placed, plus the admin role into the destination group.
+	 * @return true on success, false otherwise
+	 */
+	boolean assignDatasetToGroup(String groupNameOrId, String datasetNameOrId,
+			String apiKey, boolean addOnParents);
 
 	/**
 	 * Remove a dataset from a group.
@@ -554,4 +565,5 @@ public interface DataCatalogue {
 	 * @return a boolean value
 	 */
 	boolean isNotificationToUsersEnabled();
+
 }
diff --git a/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogueImpl.java b/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogueImpl.java
index 775793b..67f9c7f 100644
--- a/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogueImpl.java
+++ b/src/main/java/org/gcube/datacatalogue/ckanutillibrary/server/DataCatalogueImpl.java
@@ -13,10 +13,12 @@ import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
+import java.util.ListIterator;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
@@ -1338,6 +1340,56 @@ public class DataCatalogueImpl implements DataCatalogue{
 	@Override
 	public boolean assignDatasetToGroup(String groupNameOrId, String datasetNameOrId, String apiKey) {
 
+		return assignDatasetToGroupBody(groupNameOrId, datasetNameOrId, apiKey, false);
+
+	}
+
+	@Override
+	public boolean assignDatasetToGroup(String groupNameOrId, String datasetNameOrId, String apiKey, boolean addOnParents) {
+
+		return assignDatasetToGroupBody(groupNameOrId, datasetNameOrId, apiKey, addOnParents);
+
+	}
+
+	/**
+	 * Find the hierarchy of trees
+	 * @param uniqueGroups
+	 * @param catalogue
+	 * @param user's api key
+	 */
+	private void findHierarchyGroups(
+			List<String> groupsTitles, 
+			String apiKey) {
+		ListIterator<String> iterator = groupsTitles.listIterator();
+		while (iterator.hasNext()) {
+			String group = (String) iterator.next();
+
+			List<CkanGroup> parents = getParentGroups(group, apiKey);
+
+			if(parents == null || parents.isEmpty())
+				return;
+
+			for (CkanGroup ckanGroup : parents) {
+				List<String> parentsList = new ArrayList<String>(Arrays.asList(ckanGroup.getName()));
+				findHierarchyGroups(parentsList, apiKey);
+				for (String parent : parentsList) {
+					iterator.add(parent);	
+				}
+			}
+		}
+
+	}
+
+	/**
+	 * The real body of the assignDatasetToGroup
+	 * @param groupNameOrId
+	 * @param datasetNameOrId
+	 * @param apiKey
+	 * @param addOnParents
+	 * @return
+	 */
+	private boolean assignDatasetToGroupBody(String groupNameOrId, String datasetNameOrId, String apiKey, boolean addOnParents) {
+
 		// checks
 		checkNotNull(groupNameOrId);
 		checkArgument(!groupNameOrId.isEmpty());
@@ -1355,12 +1407,18 @@ public class DataCatalogueImpl implements DataCatalogue{
 			// check the group exists
 			CkanGroup group = client.getGroup(groupNameToCheck);
 
+			// move to a list
+			List<String> groupNames = new ArrayList<String>();
+			groupNames.add(group.getName());
+			if(group != null && addOnParents){
+				findHierarchyGroups(groupNames, CKAN_TOKEN_SYS);
+			}
+
 			// we need to use the apis to make it
 			String pathPackageShow = CKAN_CATALOGUE_URL + "/api/3/action/package_show?id=" + datasetNameOrId;
 			HttpGet getRequest = new HttpGet(pathPackageShow);
 			getRequest.addHeader("Authorization", CKAN_TOKEN_SYS);
 			HttpResponse response = httpClient.execute(getRequest);
-			List<String> fetchedGroups = new ArrayList<String>();
 
 			logger.debug("Response is " + response.getStatusLine().getStatusCode() + " and message is " + response.getStatusLine().getReasonPhrase());
 
@@ -1379,17 +1437,16 @@ public class DataCatalogueImpl implements DataCatalogue{
 					JSONObject object = (JSONObject) it.next();
 					try{
 						if(object.containsKey("name"))
-							fetchedGroups.add((String)object.get("name"));
+							groupNames.add((String)object.get("name"));
 					}catch(Exception e){
-						logger.error("Error while building CkanRelationship bean from object " +  object, e);
+						logger.error("Error", e);
 					}
 				}
 
-				// add the new one
-				if(!fetchedGroups.contains(group.getName()))
-					fetchedGroups.add(group.getName());
+				// remove duplicates
+				Set<String> groupNamesSet = new HashSet<String>(groupNames);
 
-				logger.debug("Groups to be added are " + fetchedGroups);
+				logger.debug("Groups to be added are " + groupNamesSet);
 
 				// now we patch the dataset with the new group
 				String pathUpdatePatch = CKAN_CATALOGUE_URL + "/api/3/action/package_patch";
@@ -1398,9 +1455,11 @@ public class DataCatalogueImpl implements DataCatalogue{
 				req.put("id", datasetNameOrId);
 
 				JSONArray groups = new JSONArray();
-				for (int i = 0;  i < fetchedGroups.size(); i++) {
+				Iterator<String> iteratorNameSet = groupNamesSet.iterator();
+				while (iteratorNameSet.hasNext()) {
+					String groupName = (String) iteratorNameSet.next();
 					JSONObject groupJSON = new JSONObject();
-					groupJSON.put("name", fetchedGroups.get(i));
+					groupJSON.put("name", groupName);
 					groups.add(groupJSON);
 				}
 				req.put("groups", groups);