diff --git a/mod/lti/classes/event/unknown_service_api_called.php b/mod/lti/classes/event/unknown_service_api_called.php
index dad8f78bdb6..9190e950b55 100644
--- a/mod/lti/classes/event/unknown_service_api_called.php
+++ b/mod/lti/classes/event/unknown_service_api_called.php
@@ -34,16 +34,28 @@ defined('MOODLE_INTERNAL') || die();
  */
 class unknown_service_api_called extends \core\event\base {
 
-    /** Old data to be used for the legacy event. */
-    protected $legacydata;
-
     /**
      * Set method for legacy data.
      *
      * @param stdClass $data legacy event data.
      */
     public function set_legacy_data($data) {
-        $this->legacydata = $data;
+        // This function is not used and will be removed in 2.7.
+    }
+
+    /**
+     * Returns custom data for event observers.
+     *
+     * @since 2.6.2
+     * @return \stdClass
+     */
+    public function get_message_data() {
+        if ($this->is_restored()) {
+            throw new \coding_exception('Function get_message_data() can not be used on restored events.');
+        }
+        $data = (object)$this->eventdata['other'];
+        $data->xml = new SimpleXMLElement($data->rawbody);
+        return $data;
     }
 
     /**
@@ -89,7 +101,6 @@ class unknown_service_api_called extends \core\event\base {
      * @return mixed
      */
     protected function get_legacy_eventdata() {
-        return $this->legacydata;
+        return $this->get_message_data();
     }
-
 }
diff --git a/mod/lti/service.php b/mod/lti/service.php
index 3150bbb2a37..1b547a320ff 100644
--- a/mod/lti/service.php
+++ b/mod/lti/service.php
@@ -147,8 +147,6 @@ switch ($messagetype) {
         //Fire an event if we get a web service request which we don't support directly.
         //This will allow others to extend the LTI services, which I expect to be a common
         //use case, at least until the spec matures.
-        // Please note that you will have to change $eventdata['other']['body'] into an xml
-        // element in an event observer as done above.
         $eventdata = array();
         $eventdata['other'] = array();
         $eventdata['other']['body'] = $rawbody;
@@ -169,7 +167,6 @@ switch ($messagetype) {
 
         try {
             $event = \mod_lti\event\unknown_service_api_called::create($eventdata);
-            $event->set_legacy_data($eventdata);
             $event->trigger();
         } catch (Exception $e) {
             $lti_web_service_handled = false;