XWIKI-12874 : There is no way to get the reference to the subscriber in the...

XWIKI-12874 : There is no way to get the reference to the subscriber in the XWiki.WatchListMessage template

xwiki-platform-core/xwiki-platform-watchlist/xwiki-platform-watchlist-api/src/main/java/org/xwiki/watchlist/internal/notification/WatchListEventMimeMessageIterator.java

@@ -64,7 +64,7 @@ public class WatchListEventMimeMessageIterator implements Iterator<MimeMessage>,
     /**
      * Subscriber reference.
      */
-    public static final DocumentReference SUBSCRIBER_REFERENCE = "subscriberReference";
+    public static final String SUBSCRIBER_REFERENCE = "subscriberReference";
 
     /**
      * Template factory "attachments" parameter.