diff --git a/presentation/lookAndFeel/knowledgeTree/documentmanagement/viewBL.php b/presentation/lookAndFeel/knowledgeTree/documentmanagement/viewBL.php
index 1a45efc..bbe3152 100644
--- a/presentation/lookAndFeel/knowledgeTree/documentmanagement/viewBL.php
+++ b/presentation/lookAndFeel/knowledgeTree/documentmanagement/viewBL.php
@@ -30,6 +30,7 @@ require_once("$default->fileSystemRoot/lib/users/User.inc");
 require_once("$default->fileSystemRoot/lib/documentmanagement/PhysicalDocumentManager.inc");
 require_once("$default->fileSystemRoot/lib/documentmanagement/DocumentTransaction.inc");
 require_once("$default->fileSystemRoot/lib/documentmanagement/Document.inc");
+require_once("$default->fileSystemRoot/lib/documentmanagement/DependantDocumentInstance.inc");
 require_once("$default->fileSystemRoot/lib/documentmanagement/DocumentCollaboration.inc");
 
 require_once("$default->fileSystemRoot/lib/archiving/DocumentArchiving.inc");