Index: kernel/db/cat_dbitem.php
===================================================================
--- kernel/db/cat_dbitem.php	(revision 15331)
+++ kernel/db/cat_dbitem.php	(working copy)
@@ -83,7 +83,7 @@
 		$this->assignToCategory($this->GetDBField('CategoryId'), true);
 	}
 
-	function Update($id=null, $system_update=false)
+	function Update($id = null, $update_fields = null, $system_update = false)
 	{
 		$this->VirtualFields['ResourceId'] = Array();
 
@@ -99,7 +99,7 @@
 			$this->generateFilename();
 		}
 
-		$ret = parent::Update($id, $system_update);
+		$ret = parent::Update($id, $update_fields, $system_update);
 
 		if ($ret) {
 			$filename = $this->useFilenames ? (string)$this->GetDBField('Filename') : '';
Index: kernel/db/dbitem.php
===================================================================
--- kernel/db/dbitem.php	(revision 15331)
+++ kernel/db/dbitem.php	(working copy)
@@ -528,9 +528,10 @@
 	*
 	* @access public
 	* @param int Primery Key Id to update
+	* @param bool $system_update
 	* @return bool
 	*/
-	function Update($id = null, $system_update = false)
+	function Update($id = null, $update_fields = null, $system_update = false)
 	{
 		if (isset($id)) {
 			$this->setID($id);
@@ -556,12 +557,15 @@
 	    }
 
 	    $sql = '';
+		$set_fields = isset($update_fields) ? $update_fields : array_keys($this->FieldValues);
 
-	    foreach ($this->FieldValues as $field_name => $field_value) {
+		foreach ($set_fields as $field_name) {
 	    	if ($this->skipField($field_name)) {
 	    		continue;
 	    	}
 
+			$field_value = $this->FieldValues[$field_name];
+
 	    	if ( is_null($field_value) ) {
 	    		if (array_key_exists('not_null', $this->Fields[$field_name]) && $this->Fields[$field_name]['not_null']) {
 	    			// "kFormatter::Parse" methods converts empty values to NULL and for
@@ -590,7 +594,16 @@
 
 		$this->saveCustomFields();
 	    $this->raiseEvent('OnAfterItemUpdate');
-	    $this->OriginalFieldValues = $this->FieldValues;
+
+		if ( !isset($update_fields) ) {
+			$this->OriginalFieldValues = $this->FieldValues;
+		}
+		else {
+			foreach ($update_fields as $update_field) {
+				$this->OriginalFieldValues[$update_field] = $this->FieldValues[$update_field];
+			}
+		}
+
 	    $this->Loaded = true;
 
 	    if ($this->mode != 't') {
Index: units/images/image_event_handler.php
===================================================================
--- units/images/image_event_handler.php	(revision 15331)
+++ units/images/image_event_handler.php	(working copy)
@@ -169,7 +169,7 @@
 			}
 		}
 		if ( in_array($event->Name, Array('OnAfterClone', 'OnBeforeCopyToLive', 'OnAfterCopyToTemp')) ) {
-			$object->Update(null, true);
+			$object->Update(null, null, true);
 		}
 	}
 
Index: units/users/users_item.php
===================================================================
--- units/users/users_item.php	(revision 15331)
+++ units/users/users_item.php	(working copy)
@@ -92,9 +92,9 @@
 		}
 
 
-		function Update($id=null, $system_update=false)
+		function Update($id = null, $update_fields = null, $system_update = false)
 		{
-			$ret = parent::Update($id, $system_update);
+			$ret = parent::Update($id, $update_fields, $system_update);
 			if ($ret) {
 				// find out how to syncronize user only when it's copied to live table
 				$sync_manager =& $this->Application->recallObjectP('UsersSyncronizeManager', null, Array(), 'InPortalSyncronize');