diff --git a/loopback/locale/es.json b/loopback/locale/es.json
index 174a9e093..8d5156842 100644
--- a/loopback/locale/es.json
+++ b/loopback/locale/es.json
@@ -174,5 +174,7 @@
 	"That item doesn't exists": "Ese artículo no existe",
 	"There's a new urgent ticket": "Hay un nuevo ticket urgente: [{{title}}](https://cau.verdnatura.es/WorkOrder.do?woMode=viewWO&woID={{issueId}})",
 	"Invalid account": "Cuenta inválida",
-	"Compensation account is empty": "La cuenta para compensar está vacia"
+	"Compensation account is empty": "La cuenta para compensar está vacia",
+	"This genus already exist": "Este genus ya existe",
+	"This specie already exist": "Esta especie ya existe"
 }
\ No newline at end of file
diff --git a/modules/item/back/models/genus.js b/modules/item/back/models/genus.js
index 462d5efd4..c105e06b4 100644
--- a/modules/item/back/models/genus.js
+++ b/modules/item/back/models/genus.js
@@ -1,9 +1,9 @@
-module.exports = Self => {
-    Self.validatesPresenceOf('name', {
-        message: 'Name cannot be blank'
-    });
+let UserError = require('vn-loopback/util/user-error');
 
-    Self.validatesUniquenessOf('id', {
-        message: 'This name already exist.'
+module.exports = Self => {
+    Self.rewriteDbError(function(err) {
+        if (err.code === 'ER_DUP_ENTRY')
+            return new UserError(`This genus already exist`);
+        return err;
     });
 };
diff --git a/modules/item/back/models/specie.js b/modules/item/back/models/specie.js
new file mode 100644
index 000000000..e6a03f851
--- /dev/null
+++ b/modules/item/back/models/specie.js
@@ -0,0 +1,9 @@
+let UserError = require('vn-loopback/util/user-error');
+
+module.exports = Self => {
+    Self.rewriteDbError(function(err) {
+        if (err.code === 'ER_DUP_ENTRY')
+            return new UserError(`This specie already exist`);
+        return err;
+    });
+};
diff --git a/modules/item/back/models/species.js b/modules/item/back/models/species.js
deleted file mode 100644
index 462d5efd4..000000000
--- a/modules/item/back/models/species.js
+++ /dev/null
@@ -1,9 +0,0 @@
-module.exports = Self => {
-    Self.validatesPresenceOf('name', {
-        message: 'Name cannot be blank'
-    });
-
-    Self.validatesUniquenessOf('id', {
-        message: 'This name already exist.'
-    });
-};