diff --git a/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/instance/ProcessInstanceImpl.java b/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/instance/ProcessInstanceImpl.java
index 568b3357dd9..2d6c5c7f420 100644
--- a/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/instance/ProcessInstanceImpl.java
+++ b/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/instance/ProcessInstanceImpl.java
@@ -69,6 +69,7 @@
 import org.exolab.castor.jdo.OQLQuery;
 import org.exolab.castor.jdo.PersistenceException;
 import org.exolab.castor.jdo.QueryResults;
+import org.silverpeas.core.admin.OrganisationControllerFactory;
 
 /**
  * This class is one implementation of interface UpdatableProcessInstance. It uses Castor library
@@ -1460,8 +1461,10 @@ public String[] getAssignedStates(User user, String roleName) throws WorkflowExc
       boolean userGroupsMatch = false;
       if (StringUtil.isDefined(wkUser.getGroupId())) {
         // check if one of userGroups matches with working group
-        if (user.getGroupIds() != null) {
-          userGroupsMatch = user.getGroupIds().contains(wkUser.getGroupId());
+        List<String> groupIds =  Arrays.asList(OrganisationControllerFactory.getOrganisationController()
+            .getAllGroupIdsOfUser(wkUser.getId()));
+        if (groupIds != null) {
+          userGroupsMatch = groupIds.contains(wkUser.getGroupId());
         }
       }
 
diff --git a/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/user/UserManagerImpl.java b/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/user/UserManagerImpl.java
index 4258de3fa47..3fa05b8a162 100644
--- a/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/user/UserManagerImpl.java
+++ b/ejb-core/formtemplate/src/main/java/com/silverpeas/workflow/engine/user/UserManagerImpl.java
@@ -184,11 +184,6 @@ private User[] getUsers(UserDetail[] userDetails) {
     UserImpl[] users = new UserImpl[userDetails.length];
     for (int i = 0; i < userDetails.length; i++) {
       users[i] = new UserImpl(userDetails[i]);
-      String[] groupIds =  OrganisationControllerFactory.getOrganisationController()
-          .getAllGroupIdsOfUser(userDetails[i].getId());
-      if (groupIds != null) {
-        users[i].setGroupIds(Arrays.asList(groupIds));
-      }
     }
     return users;
   }