diff --git a/src/function/sync/apply-actions/dispatch-parent-action/addcategoryapps.ts b/src/function/sync/apply-actions/dispatch-parent-action/addcategoryapps.ts
index a85927a..a588681 100644
--- a/src/function/sync/apply-actions/dispatch-parent-action/addcategoryapps.ts
+++ b/src/function/sync/apply-actions/dispatch-parent-action/addcategoryapps.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 - 2020 Jonas Lochmann
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -80,6 +80,16 @@ export async function dispatchAddCategoryApps ({ action, cache, fromChildSelfLim
   })).map((item) => item.categoryId)
 
   if (fromChildSelfLimitAddChildUserId !== null) {
+    for (let i = 0; i < action.packageNames.length; i++) {
+      const packageName = action.packageNames[i]
+
+      if (packageName.indexOf('@') !== -1) {
+        throw new SelfLimitationException({
+          staticMessage: 'can not do device specific assignments as child'
+        })
+      }
+    }
+
     try {
       const parentCategoriesOfTargetCategory = getCategoryWithParentCategories(categoriesOfSameChild, action.categoryId)
       const userEntryUnsafe = await cache.database.user.findOne({