diff --git a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/01599-GroupLayout.yaml b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/01599-GroupLayout.yaml
index 8a46c92..e363d45 100644
--- a/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/01599-GroupLayout.yaml
+++ b/mocha-common/data/libraries/yaml/net.alcetech.Mocha.System/003-Classes/01599-GroupLayout.yaml
@@ -11,6 +11,8 @@
     index: 1599
     customTagName: 'groupLayout'
     registerForTemplate: yes
+    superclasses:
+    - instance: '&IDC_Layout;'
     relationships:
     - instance: '&IDR_Group_Layout__uses__Group_Layout_Option;'
       customTagName: 'options'