diff --git a/api/v3/TwingleSync/models/TwingleProject.php b/api/v3/TwingleSync/models/TwingleProject.php
index 2d83da3..3517c83 100644
--- a/api/v3/TwingleSync/models/TwingleProject.php
+++ b/api/v3/TwingleSync/models/TwingleProject.php
@@ -14,8 +14,14 @@ class TwingleProject {
 
   private static $bInitialized = FALSE;
 
+  private $id;
+
+  private $project_id;
+
   private $values;
 
+  private $orig_values;
+
   private $timestamp;
 
   private $settings;
@@ -43,6 +49,9 @@ class TwingleProject {
     // Fetch custom fields once and store them in static attribute
     self::init();
 
+    // Copy values
+    $this->orig_values = $values;
+
     // Map parameters to custom field names (e.g. "custom_21")
     foreach (self::$customFields as $customField) {
       if (!empty($values[str_replace('twingle_project_', '', $customField->getName())])) {