diff --git a/db/versions/11088-bronzeAspidistra/00-firstScript.sql b/db/versions/11088-bronzeAspidistra/00-firstScript.sql
index 2cc4e715e..98203c9d1 100644
--- a/db/versions/11088-bronzeAspidistra/00-firstScript.sql
+++ b/db/versions/11088-bronzeAspidistra/00-firstScript.sql
@@ -1,4 +1,3 @@
--- Place your SQL code here
 DROP TABLE IF EXISTS vn.wagonTypeTray;
 
 CREATE TABLE vn.wagonTypeTray (
@@ -20,7 +19,3 @@ ALTER TABLE vn.wagonConfig ADD CONSTRAINT wagonConfig_wagonTypeColor_FK FOREIGN
 
 ALTER TABLE vn.wagonTypeTray DROP FOREIGN KEY wagonTypeTray_wagonType_FK;
 ALTER TABLE vn.wagonTypeTray ADD CONSTRAINT wagonTypeTray_wagonType_FK FOREIGN KEY (wagonTypeFk) REFERENCES vn.wagonType(id) ON DELETE CASCADE ON UPDATE RESTRICT;
-
-
-
--- insertar datos por defecto
\ No newline at end of file
diff --git a/loopback/locale/es.json b/loopback/locale/es.json
index e2be5d013..47601ae41 100644
--- a/loopback/locale/es.json
+++ b/loopback/locale/es.json
@@ -367,5 +367,9 @@
 	"It has been invoiced but the PDF of refund not be generated": "Se ha facturado pero no se ha podido generar el PDF del abono",
 	"Payment method is required": "El método de pago es obligatorio",
 	"Cannot send mail": "Não é possível enviar o email",
-	"CONSTRAINT `supplierAccountTooShort` failed for `vn`.`supplier`": "La cuenta debe tener exactamente 10 dígitos"
-}
+	"CONSTRAINT `supplierAccountTooShort` failed for `vn`.`supplier`": "La cuenta debe tener exactamente 10 dígitos",
+	"There is already a tray with the same height": "Ya existe una bandeja con la misma altura",
+	"You must define wagon and height": "Debes definir un tipo de vagón y la altura",
+	"The maximum height of the wagon is": "La altura máxima es %d",
+	"The height must be greater than": "The height must be greater than %d"
+}
\ No newline at end of file
diff --git a/modules/wagon/back/models/wagon-type-tray.js b/modules/wagon/back/models/wagon-type-tray.js
index e32938743..5bcb1d3c7 100644
--- a/modules/wagon/back/models/wagon-type-tray.js
+++ b/modules/wagon/back/models/wagon-type-tray.js
@@ -1,16 +1,28 @@
-// module.exports = Self => {
-//     Self.observe('before save', async ctx => {
-//         if (ctx.isNewInstance) {
-//             const models = Self.app.models;
-//             const config = await models.WagonConfig.findOne();
+const UserError = require('vn-loopback/util/user-error');
 
-//             await models.WagonTypeTray.create({
-//                 wagonTypeFk: config.wagonTypeFk,
-//                 height: config.height,
-//                 wagonTypeColorFk: config.wagonTypeColorFk
-//             }, ctx.options);
-//         }
-//         if (ctx.instance < config.minHeightBetweenTrays)
-//             throw new Error('Height must be greater than ' + config.minHeightBetweenTrays);
-//     });
-// };
+module.exports = Self => {
+    Self.observe('before save', async ctx => {
+        if (ctx.isNewInstance) {
+            const models = Self.app.models;
+            const {wagonTypeFk, height} = ctx.instance;
+            const trays = await models.WagonTypeTray.find({where: {wagonTypeFk}});
+
+            const config = await models.WagonConfig.findOne();
+            const tray = await models.WagonTypeTray.find({where: {wagonTypeFk, height}});
+
+            if (!trays.length) return;
+
+            if (tray.length)
+                throw new UserError('There is already a tray with the same height');
+
+            if (!wagonTypeFk && !height)
+                throw new UserError('You must define wagon and height');
+
+            if (height < config.minHeightBetweenTrays)
+                throw new UserError('The height must be greater than', 'HEIGHT_GREATER_THAN', config.minHeightBetweenTrays);
+
+            if (height > config.maxWagonHeight)
+                throw new UserError('The maximum height of the wagon is', 'MAX_WAGON_HEIGHT', config.maxWagonHeight);
+        }
+    });
+};