static function checkDuplicatePo($key)
 {
     $purchase = new Purchase($key);
     //Search Duplicate
     $records = fRecordSet::build('Purchase', array('po_number=' => $purchase->getPoNumber()));
     if ($records->count() > 1) {
         //Generate New PO
         echo 'Duplicate PO';
         $exploded = explode('/', $purchase->getPoNumber());
         echo (int) $exploded[2] + 1;
         $exploded[2] = sprintf("%03d", (int) $exploded[2] + 1);
         $newPONumber = implode('/', $exploded);
         $purchase->setPoNumber($newPONumber);
         $purchase->store();
     }
 }
 $key = $_POST["key"];
 $purchase = new Purchase($key);
 $purchase->populate();
 $json_form = fRequest::get('jsonForm');
 $jsonForm = fJSON::decode($json_form);
 $total = 0;
 if ($_POST['approver_1'] != null && $_POST['approver_1_date'] != null) {
     $currentDocType = $purchase->getDocType();
     switch ($currentDocType) {
         case "1":
             //$purchase->setDocType('PO1');
             $user = new User($purchase->getRequester());
             $branch = $user->getBranchId();
             $newRunningNumber = sprintf("%03d", Purchase::findPOByBranch($branch, '1')->count() + 1);
             $newPONumber = "PO1/" . $branch . "/" . $newRunningNumber . "/" . date("m/Y");
             $purchase->setPoNumber($newPONumber);
             break;
         case "2":
             //$purchase->setDocType('PO2');
             $user = new User($purchase->getRequester());
             $branch = $user->getBranchId();
             $newRunningNumber = sprintf("%03d", Purchase::findPOByBranch($branch, '2')->count() + 1);
             $newPONumber = "PO2/" . $branch . "/" . $newRunningNumber . "/" . date("m/Y");
             $purchase->setPoNumber($newPONumber);
             break;
         case "3":
             //$purchase->setDocType('PO3');
             $user = new User($purchase->getRequester());
             $branch = $user->getBranchId();
             $newRunningNumber = sprintf("%03d", Purchase::findPOByBranch($branch, '3')->count() + 1);
             $newPONumber = "PO3/" . $branch . "/" . $newRunningNumber . "/" . date("m/Y");