diff --git a/valuestore.py b/valuestore.py
index 1a4cabf..9fc2e88 100644
--- a/valuestore.py
+++ b/valuestore.py
@@ -30,6 +30,16 @@ class ValueStore(ModelSQL):
         string='Digits', readonly=True),
         'on_change_with_valuedigits')
 
+    @classmethod
+    def __register__(cls, module_name):
+        super(ValueStore, cls).__register__(module_name)
+
+        # clear value-store, re-calc
+        records = cls.search([])
+        if records:
+            cls.delete(records)
+        cls.maintenance_values()
+
     @classmethod
     def __setup__(cls):
         super(ValueStore, cls).__setup__()