diff --git a/ktapi/KTAPIFolder.inc.php b/ktapi/KTAPIFolder.inc.php
index 100667b..a2a2b7e 100644
--- a/ktapi/KTAPIFolder.inc.php
+++ b/ktapi/KTAPIFolder.inc.php
@@ -121,6 +121,7 @@ class KTAPI_Folder extends KTAPI_FolderItem
 	 */
 	function get_detail()
 	{
+		$this->clearCache();
 		$detail = array(
 			'id'=>(int) $this->folderid,
 			'folder_name'=>$this->get_folder_name(),
@@ -131,6 +132,19 @@ class KTAPI_Folder extends KTAPI_FolderItem
 		return $detail;
 	}
 
+	function clearCache()
+	{
+		// TODO: we should only clear the cache for the document we are working on
+		// this is a quick fix but not optimal!!
+
+		$cache = KTCache::getSingleton();
+
+		$cache->remove('Folder/id', $this->folderid);
+
+		$this->folder = &Folder::get($this->folderid);
+	}
+
+
 	function get_parent_folder_id()
 	{
 		return (int) $this->folder->getParentID();
@@ -479,13 +493,16 @@ class KTAPI_Folder extends KTAPI_FolderItem
 						$docTypeId = $document->getDocumentTypeID();
 						$documentType = DocumentType::get($docTypeId);
 
+						$oemDocumentNo = $document->getOemNo();
+						if (empty($oemDocumentNo)) $oemDocumentNo = 'n/a';
+
 
 						$contents[] = array(
 							'id' => (int) $document->getId(),
 							'item_type' => 'D',
 
 							'custom_document_no'=>'n/a',
-							'oem_document_no'=>'n/a',
+							'oem_document_no'=>$oemDocumentNo,
 
 							'title' => $document->getName(),
 							'document_type'=>$documentType->getName(),
diff --git a/ktapi/ktapi.inc.php b/ktapi/ktapi.inc.php
index a7fbb3a..abe5caf 100644
--- a/ktapi/ktapi.inc.php
+++ b/ktapi/ktapi.inc.php
@@ -179,6 +179,36 @@ class KTAPI
 		return $user;
  	}
 
+ 	/**
+ 	 * Search for documents matching the oem_no.
+ 	 *
+ 	 * Note that oem_no is associated with a document and not with version of file (document content).
+ 	 * oem_no is set on a document using document::update_sysdata().
+ 	 *
+ 	 * @param string $oem_no
+ 	 * @param boolean idsOnly Defaults to true
+ 	 * @return array
+ 	 */
+ 	function get_documents_by_oem_no($oem_no, $idsOnly=true)
+ 	{
+		$sql = array("SELECT id FROM documents WHERE oem_no=?",$oem_no);
+		$rows = DBUtil::getResultArray($sql);
+		if (is_null($rows) || PEAR::isError($rows))
+		{
+			return new KTAPI_Error(KTAPI_ERROR_INTERNAL_ERROR, $rows);
+		}
+
+		$result = array();
+		foreach($rows as $row)
+		{
+			$documentid = $row['id'];
+
+			$result[] = $idsOnly?$documentid:KTAPI_Document::get($this, $documentid);
+		}
+
+ 		return $result;
+ 	}
+
 	/**
 	 * This returns a session object based on a session string.
 	 *