diff --git a/workflow/engine/classes/class.processes.php b/workflow/engine/classes/class.processes.php
index 5d8eb46ea..435dd6fd2 100755
--- a/workflow/engine/classes/class.processes.php
+++ b/workflow/engine/classes/class.processes.php
@@ -202,6 +202,18 @@ class Processes
         return $oOutput->outputExists( $sUid );
     }
 
+    /**
+     * verify if the object exists
+     *
+     * @param string $sUid
+     * @return boolean
+     */
+    public function processVariableExists ($sUid = '')
+    {
+        $oProcessVariable = new ProcessVariables();
+        return $oProcessVariable->ProcessVariableExists( $sUid );
+    }
+
     /**
      * verify if the object exists
      *
@@ -638,6 +650,19 @@ class Processes
         }
     }
 
+    /**
+     * get an unused process variables GUID
+     *
+     * @return $sProUid
+     */
+    public function getUnusedProcessVariableGUID ()
+    {
+        do {
+            $sNewUid = G::generateUniqueID();
+        } while ($this->processVariableExists( $sNewUid ));
+        return $sNewUid;
+    }
+
     /**
      * change the GUID for a serialized process
      *
@@ -2111,6 +2136,29 @@ class Processes
         }
     }
 
+    /**
+     * Renew all the unique id for "Process User"
+     *
+     * @param $data Object with the data
+     *
+     * return void
+     */
+    public function renewAllProcessVariableUid(&$data)
+    {
+        try {
+            $map = array ();
+            foreach ($data->processVariables as $key => $val) {
+                if (isset( $val['VAR_UID'] )) {
+                    $newGuid = $this->getUnusedProcessVariableGUID();
+                    $map[$val['VAR_UID']] = $newGuid;
+                    $data->processVariables[$key]['VAR_UID'] = $newGuid;
+                }
+            }
+
+        } catch (Exception $e) {
+            throw $e;
+        }
+    }
     /**
      * Renew the GUID's for all the Uids for all the elements
      *
@@ -2140,6 +2188,7 @@ class Processes
         $this->renewAllEvent( $oData );
         $this->renewAllCaseScheduler( $oData );
         $this->renewAllProcessUserUid($oData);
+        $this->renewAllProcessVariableUid($oData);
     }
 
     /**
diff --git a/workflow/engine/classes/model/ProcessVariables.php b/workflow/engine/classes/model/ProcessVariables.php
old mode 100644
new mode 100755
index b473d619f..6d1f2a4a2
--- a/workflow/engine/classes/model/ProcessVariables.php
+++ b/workflow/engine/classes/model/ProcessVariables.php
@@ -64,4 +64,26 @@ class ProcessVariables extends BaseProcessVariables {
             throw($oError);
         }
     }
+
+    /**
+     * verify if process variable row specified in [sUid] exists.
+     *
+     * @param      string $sUid   the uid
+     */
+    public function ProcessVariableExists($sUid)
+    {
+        $con = Propel::getConnection(ProcessVariablesPeer::DATABASE_NAME);
+
+        try {
+            $oObj = ProcessVariablesPeer::retrieveByPk($sUid);
+
+            if (is_object($oObj) && get_class($oObj) == 'ProcessVariables') {
+                return true;
+            } else {
+                return false;
+            }
+        } catch (Exception $oError) {
+            throw ($oError);
+        }
+    }
 } // ProcessVariables