diff --git a/db/changes/230201/00-triggersXDiario.sql b/db/changes/230201/00-triggersXDiario.sql
index 3efed0f76..b31157a3f 100644
--- a/db/changes/230201/00-triggersXDiario.sql
+++ b/db/changes/230201/00-triggersXDiario.sql
@@ -8,13 +8,19 @@ CREATE DEFINER=`root`@`localhost` TRIGGER `vn`.`XDiario_beforeUpdate`
 	FOR EACH ROW
 BEGIN
     IF NOT NEW.SUBCTA <=> OLD.SUBCTA THEN
-        IF NOT util.checkLength(NEW.SUBCTA, 10) THEN
-            CALL util.throw('INVALID_LENGTH');
+        IF NEW.SUBCTA <=> '' THEN
+            SET NEW.SUBCTA = NULL;
+        END IF;
+        IF NEW.SUBCTA IS NOT NULL AND NOT util.checkStringLength(NEW.SUBCTA, 10) THEN
+            CALL util.throw('INVALID_STRING_LENGTH');
         END IF;
     END IF;
     IF NOT NEW.CONTRA <=> OLD.CONTRA THEN
-        IF NOT util.checkLength(NEW.CONTRA, 10) THEN
-            CALL util.throw('INVALID_LENGTH');
+        IF NEW.CONTRA <=> '' THEN
+            SET NEW.CONTRA = NULL;
+        END IF;
+        IF NEW.CONTRA IS NOT NULL AND NOT util.checkStringLength(NEW.CONTRA, 10) THEN
+            CALL util.throw('INVALID_STRING_LENGTH');
         END IF;
     END IF;
     IF NOT NEW.FECHA <=> OLD.FECHA THEN
@@ -45,11 +51,17 @@ CREATE DEFINER=`root`@`localhost` TRIGGER `vn`.`XDiario_beforeInsert`
 	BEFORE INSERT ON `XDiario`
 	FOR EACH ROW
 BEGIN
-    IF NOT util.checkLength(NEW.SUBCTA, 10) THEN
-        CALL util.throw('INVALID_LENGTH');
+    IF NEW.SUBCTA <=> '' THEN
+        SET NEW.SUBCTA = NULL;
     END IF;
-    IF NOT util.checkLength(NEW.CONTRA, 10) THEN
-        CALL util.throw('INVALID_LENGTH');
+    IF NEW.SUBCTA IS NOT NULL AND NOT util.checkStringLength(NEW.SUBCTA, 10) THEN
+        CALL util.throw('INVALID_STRING_LENGTH');
+    END IF;
+    IF NEW.CONTRA <=> '' THEN
+        SET NEW.CONTRA = NULL;
+    END IF;
+    IF NEW.CONTRA IS NOT NULL AND NOT util.checkStringLength(NEW.CONTRA, 10) THEN
+        CALL util.throw('INVALID_STRING_LENGTH');
     END IF;
     CALL XDiario_checkDate(NEW.FECHA);
     CALL XDiario_checkDate(NEW.FECHA_EX);
@@ -60,11 +72,11 @@ END$$
 DELIMITER ;
 
 
-DROP FUNCTION IF EXISTS `util`.`checkLength`;
+DROP FUNCTION IF EXISTS `util`.`checkStringLength`;
 
 DELIMITER $$
 $$
-CREATE DEFINER=`root`@`localhost` FUNCTION `util`.`checkLength`(vString VARCHAR(10), vLength INT(11)) RETURNS tinyint(1)
+CREATE DEFINER=`root`@`localhost` FUNCTION `util`.`checkStringLength`(vString VARCHAR(255), vLength INT(3)) RETURNS tinyint(1)
     DETERMINISTIC
 BEGIN
 /**
@@ -74,10 +86,7 @@ BEGIN
  * @param vLength Longitud que debe tener
  * @return Devuelve TRUE/FALSE en caso de que tenga la longitud correcta o no
  */
-	IF LENGTH(vString) <=> vLength THEN
-        RETURN TRUE;
-    END IF;
-    RETURN FALSE;
+    RETURN LENGTH(vString) <=> vLength;
 END$$
 DELIMITER ;