diff --git a/lib/manage_configs.py b/lib/manage_configs.py
index 91ae281..121c8a8 100644
--- a/lib/manage_configs.py
+++ b/lib/manage_configs.py
@@ -451,11 +451,16 @@ class Configs:
 
         self.TOSGruppen = TOSGroupsConfig(cfg_dir)
         self.Materialien = MaterialTransConfig(cfg_dir)
+        self.TeileNummern = None
         self._env = None
 
     def get_cfg_path(self):
         return self._cfg_dir
     
+    def set_data_dir(self, data_dir):
+        self._data_dir = data_dir
+        self.TeileNummern = RuleDesignerDatabaseConfig(data_dir)
+
     def set_env(self, env):
         self._env = env