diff --git a/cap-notebook/demoapp/srv/attachment-extension.cds b/cap-notebook/demoapp/srv/attachment-extension.cds
index 67183bda..a6f8f607 100644
--- a/cap-notebook/demoapp/srv/attachment-extension.cds
+++ b/cap-notebook/demoapp/srv/attachment-extension.cds
@@ -3,6 +3,8 @@ using {sap.attachments.Attachments, sap.attachments.StatusCode} from`com.sap.cds
 
 extend entity Books with {
     attachments : Composition of many Attachments @SDM.Attachments:{maxCount: 4, maxCountError:'Only 4 attachments allowed.'};
+    references : Composition of many Attachments @SDM.attachments: {maxCount: 2, maxCountError: 'Only 2 attachments allowed'};
+    footnotes : Composition of many Attachments;
 }
 
 entity Statuses @cds.autoexpose @readonly {