diff --git a/beesdoo_shift/__openerp__.py b/beesdoo_shift/__openerp__.py
index c5920b2..3344656 100644
--- a/beesdoo_shift/__openerp__.py
+++ b/beesdoo_shift/__openerp__.py
@@ -13,7 +13,7 @@
     'website': "https://github.com/beescoop/Obeesdoo",
 
     'category': 'Cooperative management',
-    'version': '9.0.1.2.1',
+    'version': '9.0.1.2.3',
 
     'depends': ['beesdoo_base'],
 
diff --git a/beesdoo_shift/migrations/9.0.1.2.3/post-migrate.py b/beesdoo_shift/migrations/9.0.1.2.3/post-migrate.py
new file mode 100644
index 0000000..88297a5
--- /dev/null
+++ b/beesdoo_shift/migrations/9.0.1.2.3/post-migrate.py
@@ -0,0 +1,16 @@
+# coding: utf-8
+
+
+def migrate(cr, version):
+    """Fix bug occuring when trying to save a temporary exempt
+     (missing sequence in database). """
+    cr.execute(
+        """
+        CREATE SEQUENCE IF NOT EXISTS beesdoo_website_shift_config_settings_id_seq
+        """
+    )
+    cr.execute(
+        """
+        CREATE SEQUENCE IF NOT EXISTS beesdoo_shift_temporary_exemption_id_seq
+        """
+    )