db/routines/util/functions/checkPrintableChars.sql

@@ -0,0 +1,15 @@
+DELIMITER $$
+CREATE OR REPLACE DEFINER=`root`@`localhost` FUNCTION `util`.`checkPrintableChars`(
+    vString VARCHAR(255)
+)   RETURNS tinyint(1)
+    DETERMINISTIC
+BEGIN
+/**
+ * Validates whether the input string contains only printable characters  
+ * and Spanish special characters (such as ¡, ÿ, etc.).
+ *
+ * @vString string to check
+ */
+    RETURN vString REGEXP '^[ -~¡-ÿ]*$';
+END$$
+DELIMITER ;

db/routines/vn/triggers/invoiceIn_beforeInsert.sql

@@ -9,6 +9,10 @@ BEGIN
 	DECLARE vActive TINYINT;
 	DECLARE vWithholdingSageFk INT;
 
+	IF NOT util.checkPrintableChars(NEW.supplierRef) THEN
+		CALL util.throw('The invoiceIn reference contains invalid characters');
+	END IF;
+
 	SET NEW.editorFk = account.myUser_getId();
 	
 	SELECT  withholdingSageFk INTO  vWithholdingSageFk 

db/routines/vn/triggers/invoiceIn_beforeUpdate.sql

@@ -3,9 +3,12 @@ CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`invoiceIn_beforeUpdat
 	BEFORE UPDATE ON `invoiceIn`
 	FOR EACH ROW
 BEGIN
-
 	DECLARE vWithholdingSageFk INT;
 
+	IF NOT (NEW.supplierRef <=> OLD.supplierRef) AND NOT util.checkPrintableChars(NEW.supplierRef) THEN
+		CALL util.throw('The invoiceIn reference contains invalid characters');
+	END IF;
+
 	SET NEW.editorFk = account.myUser_getId();
 
 	IF (SELECT COUNT(*) FROM vn.invoiceIn