diff --git a/datamodels/2.x/itop-attachments/ajax.attachment.php b/datamodels/2.x/itop-attachments/ajax.attachment.php
index f8b453dde..6b11bd573 100755
--- a/datamodels/2.x/itop-attachments/ajax.attachment.php
+++ b/datamodels/2.x/itop-attachments/ajax.attachment.php
@@ -52,7 +52,7 @@ try
 			'msg' => ''
 		);
 		$sObjClass = stripslashes(utils::ReadParam('obj_class', '', false, 'class'));
-		$sTempId = utils::ReadParam('temp_id', '');
+		$sTempId = utils::ReadParam('temp_id', '', false, 'transaction_id');
 		if (empty($sObjClass))
 		{
 			$aResult['error'] = "Missing argument 'obj_class'";