diff --git a/update/2_4_47.sql b/update/2_4_47.sql
new file mode 100644
index 000000000..4ae2fdf36
--- /dev/null
+++ b/update/2_4_47.sql
@@ -0,0 +1,2 @@
+-- Aggiunta vincolo fra ddt e righe ddt
+ALTER TABLE `dt_righe_ddt` ADD CONSTRAINT `dt_righe_ddt_ibfk_2` FOREIGN KEY (`idddt`) REFERENCES `dt_ddt`(`id`) ON DELETE CASCADE ON UPDATE RESTRICT; 
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