attempt to fix problem of comment-visiblity on multiple assignments of the ticket in question

etemplate/inc/class.bo_tracking.inc.php

@@ -660,6 +660,16 @@ abstract class bo_tracking
 	 */
 	protected $body_cache = array();
 
+	/**
+	 * method to clear the Cache for notificaton body
+	 *
+	 * Cache is by id, language, date-format and type text/html
+	 */
+	public function ClearBodyCache()
+	{
+		$this->body_cache = array();
+	}
+
 	/**
 	 * Sending a notification to the given email-address
 	 *