diff --git a/workflow/engine/classes/class.derivation.php b/workflow/engine/classes/class.derivation.php
index 716954179..9b8a9b5ed 100644
--- a/workflow/engine/classes/class.derivation.php
+++ b/workflow/engine/classes/class.derivation.php
@@ -605,17 +605,36 @@ class Derivation
                 if (isset( $useruid ) && $useruid != '') {
                     $userFields = $this->getUsersFullNameFromArray( $useruid );
                 }
-
                 // if there is no report_to user info, throw an exception indicating this
                 if (! isset( $userFields ) || $userFields['USR_UID'] == '') {
                     throw (new Exception( G::LoadTranslation( 'ID_MSJ_REPORSTO' ) )); // "The current user does not have a valid Reports To user.  Please contact administrator.") ) ;
                 }
                 break;
             case 'SELF_SERVICE':
+                $AppFields = $this->case->loadCase($tasInfo['APP_UID']);
+                $variable = str_replace('@@', '', $nextAssignedTask['TAS_GROUP_VARIABLE']);
+
+                if (isset($AppFields['APP_DATA'][$variable])) {
+                    $arrVar = $AppFields['APP_DATA'][$variable];
+                    if (is_array($arrVar)) {
+                        $statusToCheck = $arrVar;
+                    } else {
+                        $statusToCheck = array($arrVar);
+                    }
+                    $toValidate = array('ACTIVE', 'VACATION');
+                    $gpr = new GroupUser();
+                    if (!$gpr->groupsUsersAvailable($statusToCheck, $toValidate)) {
+                        if (!($gpr->groupsUsersAvailable($statusToCheck, $toValidate, "groups"))) {
+                            throw (new Exception("Task doesn't have a valid user in variable $variable or this variable doesn't exist."));
+                        }
+                    }
+                } else {
+                    throw (new Exception("Task doesn't have a valid user in variable $variable or this variable doesn't exist."));
+                }
                 //look for USR_REPORTS_TO to this user
                 $userFields['USR_UID'] = '';
-                $userFields['USR_FULLNAME'] = '<b>' . G::LoadTranslation( 'ID_UNASSIGNED' ) . '</b>';
-                $userFields['USR_USERNAME'] = '<b>' . G::LoadTranslation( 'ID_UNASSIGNED' ) . '</b>';
+                $userFields['USR_FULLNAME'] = '<b>' . G::LoadTranslation('ID_UNASSIGNED') . '</b>';
+                $userFields['USR_USERNAME'] = '<b>' . G::LoadTranslation('ID_UNASSIGNED') . '</b>';
                 $userFields['USR_FIRSTNAME'] = '';
                 $userFields['USR_LASTNAME'] = '';
                 $userFields['USR_EMAIL'] = '';
diff --git a/workflow/engine/classes/model/GroupUser.php b/workflow/engine/classes/model/GroupUser.php
index 639d09b54..bf082de4f 100644
--- a/workflow/engine/classes/model/GroupUser.php
+++ b/workflow/engine/classes/model/GroupUser.php
@@ -179,5 +179,43 @@ class GroupUser extends BaseGroupUser
 
         return $rows;
     }
+
+    /**
+     * This function check if the array have at least one UID valid
+     * Ex. we need to check the data for self service value based assignment
+     *
+     * @param array $toValidate , this array contains uid of user or uid of groups
+     * @param array $statusToCheck , this array must be have a valid status for users or groups, ACTIVE INACTIVE VACATION
+     * @param string $tableReview , if you need to check uid for users or groups
+     * @return boolean $rows
+     */
+    public function groupsUsersAvailable($toValidate, $statusToCheck = array('ACTIVE'), $tableReview = 'users')
+    {
+        //Define the batching value for the MySQL error related to max_allowed_packet
+        $batching = 25000;
+        $array = array_chunk($toValidate, $batching);
+        foreach ($array as $key => $uidValues) {
+            $oCriteria = new Criteria('workflow');
+            switch ($tableReview) {
+                case 'groups':
+                    $oCriteria->add(GroupwfPeer::GRP_UID, $uidValues, Criteria::IN);
+                    $oCriteria->add(GroupwfPeer::GRP_STATUS, $statusToCheck, Criteria::IN);
+                    $oCriteria->setLimit(1);
+                    $rsCriteria = GroupwfPeer::doSelectRS($oCriteria);
+                    break;
+                default:
+                    $oCriteria->add(UsersPeer::USR_UID, $uidValues, Criteria::IN);
+                    $oCriteria->add(UsersPeer::USR_STATUS, $statusToCheck, Criteria::IN);
+                    $oCriteria->setLimit(1);
+                    $rsCriteria = UsersPeer::doSelectRS($oCriteria);
+                    break;
+            }
+            $rsCriteria->setFetchmode(ResultSet::FETCHMODE_ASSOC);
+            if ($rsCriteria->next()) {
+                return true;
+            }
+        }
+        return false;
+    }
 }