diff --git a/ucs-4.0-0/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/umc_operationset.py b/ucs-4.0-0/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/umc_operationset.py
index fdf695f..6057f56 100644
--- a/ucs-4.0-0/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/umc_operationset.py
+++ b/ucs-4.0-0/management/univention-directory-manager-modules/modules/univention/admin/handlers/settings/umc_operationset.py
@@ -71,7 +71,7 @@ property_descriptions={
 			include_in_default_search=1,
 			options=[],
 			dontsearch=1,
-			required=0,
+			required=1,
 			may_change=1,
 			identifies=0,
 		),