+-- @tag: orderitems_delivery_order_items_invoice_foreign_keys
+-- @description: Fremdschlüssel für Tabellen oderitems, delivery_order_items, invoice
+-- @depends: release_3_0_0
+-- @charset: utf-8
+UPDATE orderitems SET pricegroup_id = NULL WHERE pricegroup_id = 0;
+UPDATE delivery_order_items SET pricegroup_id = NULL WHERE pricegroup_id = 0;
+UPDATE invoice SET pricegroup_id = NULL WHERE pricegroup_id = 0;
+
+UPDATE orderitems SET project_id = NULL WHERE project_id NOT IN (SELECT id FROM project);
+UPDATE delivery_order_items SET project_id = NULL WHERE project_id NOT IN (SELECT id FROM project);
+UPDATE invoice SET project_id = NULL WHERE project_id NOT IN (SELECT id FROM project);
+
+ALTER TABLE orderitems ADD FOREIGN KEY (trans_id) REFERENCES oe (id);
+ALTER TABLE orderitems ADD FOREIGN KEY (project_id) REFERENCES project (id);
+ALTER TABLE orderitems ADD FOREIGN KEY (pricegroup_id) REFERENCES pricegroup (id);
+ALTER TABLE orderitems ADD FOREIGN KEY (price_factor_id) REFERENCES price_factors (id);
+
+ALTER TABLE delivery_order_items ADD FOREIGN KEY (pricegroup_id) REFERENCES pricegroup (id);
+
+ALTER TABLE invoice ADD FOREIGN KEY (project_id) REFERENCES project (id);
+ALTER TABLE invoice ADD FOREIGN KEY (pricegroup_id) REFERENCES pricegroup (id);
+ALTER TABLE invoice ADD FOREIGN KEY (price_factor_id) REFERENCES price_factors (id);