--- /dev/null
+-- @tag: deliveryorder_type
+-- @description: Persistente Typen in Lieferscheinen
+-- @depends: release_3_5_8
+
+ALTER TABLE delivery_orders ADD COLUMN order_type TEXT;
+
+UPDATE delivery_orders SET order_type = 'sales_delivery_order' WHERE customer_id IS NOT NULL;
+UPDATE delivery_orders SET order_type = 'purchase_delivery_order' WHERE vendor_id IS NOT NULL;
+
+ALTER TABLE delivery_orders ALTER COLUMN order_type SET NOT NULL;
+
+