diff --git a/mrp_operations_extension/i18n/es.po b/mrp_operations_extension/i18n/es.po
index 24fa42bad..5e75485fd 100644
--- a/mrp_operations_extension/i18n/es.po
+++ b/mrp_operations_extension/i18n/es.po
@@ -7,7 +7,7 @@ msgstr ""
 "Project-Id-Version: Odoo Server 8.0\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2015-03-03 13:44+0000\n"
-"PO-Revision-Date: 2015-03-03 14:53+0100\n"
+"PO-Revision-Date: 2015-03-12 09:36+0100\n"
 "Last-Translator: Alfredo <alfredodelafuente@avanzosc.com>\n"
 "Language-Team: \n"
 "MIME-Version: 1.0\n"
@@ -36,7 +36,7 @@ msgstr "Al menos una orden de trabajo debe tener marcada 'Producir aquí'"
 #. module: mrp_operations_extension
 #: model:ir.model,name:mrp_operations_extension.model_mrp_bom
 msgid "Bill of Material"
-msgstr "Lista de material"
+msgstr "Lista de materiales"
 
 #. module: mrp_operations_extension
 #: view:mrp.work.order.produce:mrp_operations_extension.view_mrp_product_consume_wizard
@@ -161,7 +161,7 @@ msgstr "Producto final a existencias"
 #: view:mrp.production:mrp_operations_extension.mrp_production_operation_buttons_form_view
 #: view:mrp.production.workcenter.line:mrp_operations_extension.workcenter_line_inh_form_view
 msgid "Force Reservation"
-msgstr "Forzar reservas"
+msgstr "Forzar reserva"
 
 #. module: mrp_operations_extension
 #: field:mrp.operation.workcenter,id:0
@@ -223,7 +223,7 @@ msgstr "Operadores de fabricación"
 #. module: mrp_operations_extension
 #: model:ir.model,name:mrp_operations_extension.model_mrp_production
 msgid "Manufacturing Order"
-msgstr "Órden de producción"
+msgstr "Orden de producción"
 
 #. module: mrp_operations_extension
 #: view:mrp.production:mrp_operations_extension.mrp_production_form_view_inh
@@ -234,13 +234,13 @@ msgstr "Materiales"
 #: code:addons/mrp_operations_extension/models/mrp_production.py:142
 #, python-format
 msgid "Missing materials"
-msgstr "Esperando materiales"
+msgstr "Faltan materiales"
 
 #. module: mrp_operations_extension
 #: code:addons/mrp_operations_extension/models/mrp_production.py:143
 #, python-format
 msgid "Missing materials to start the production"
-msgstr "Esperando materiales para empezar la producción"
+msgstr "Faltan materiales para empezar la producción"
 
 #. module: mrp_operations_extension
 #: field:mrp.work.order.produce,mode:0
@@ -250,7 +250,7 @@ msgstr "Modo"
 #. module: mrp_operations_extension
 #: field:mrp.production.workcenter.line,move_lines:0
 msgid "Moves"
-msgstr "Moves"
+msgstr "Movimientos"
 
 #. module: mrp_operations_extension
 #: field:mrp.routing.operation,name:0
@@ -324,7 +324,7 @@ msgstr "Producto de coste de pre-operación"
 #: field:mrp.routing,previous_operations_finished:0
 #: field:mrp.routing.workcenter,previous_operations_finished:0
 msgid "Previous operations finished"
-msgstr "Operaciones previsas terminadas"
+msgstr "Operaciones previas terminadas"
 
 #. module: mrp_operations_extension
 #: code:addons/mrp_operations_extension/models/mrp_production.py:139
@@ -362,7 +362,7 @@ msgstr "Líneas de producto"
 #. module: mrp_operations_extension
 #: model:ir.model,name:mrp_operations_extension.model_mrp_product_produce_line
 msgid "Product Produce Consume lines"
-msgstr "Líneas de consumo de los producto producidos"
+msgstr "Líneas de consumo de los productos producidos"
 
 #. module: mrp_operations_extension
 #: view:mrp.production:mrp_operations_extension.mrp_production_form_view_inh
@@ -373,7 +373,7 @@ msgstr "Producto a producir"
 #. module: mrp_operations_extension
 #: model:ir.model,name:mrp_operations_extension.model_mrp_production_product_line
 msgid "Production Scheduled Product"
-msgstr "Fabricación planificada producto"
+msgstr "Producto planificado de producción"
 
 #. module: mrp_operations_extension
 #: field:mrp.work.order.produce,consume_lines:0
diff --git a/mrp_operations_extension/models/mrp_production.py b/mrp_operations_extension/models/mrp_production.py
index f0e330e45..c9a9d4897 100644
--- a/mrp_operations_extension/models/mrp_production.py
+++ b/mrp_operations_extension/models/mrp_production.py
@@ -23,14 +23,7 @@ class MrpProduction(models.Model):
     _inherit = 'mrp.production'
 
     def _get_minor_sequence_operation(self, operations):
-        if operations and len(operations) > 1:
-            minor_operation = operations[0]
-            for operation in operations[1:]:
-                if minor_operation.sequence > operation:
-                    minor_operation = operation
-            return minor_operation
-        else:
-            return operations and operations[0]
+        return min(operations, key=lambda x: x.sequence)
 
     @api.model
     def _moves_assigned(self):
@@ -135,10 +128,8 @@ class MrpProductionWorkcenterLine(models.Model):
     def action_start_working(self):
         if self.routing_wc_line.previous_operations_finished and \
                 not self.check_minor_sequence_operations():
-            raise exceptions.Warning(_("Not finished operations"),
-                                     _("Previous operations not finished"))
+            raise exceptions.Warning(_("Previous operations not finished"))
         if not self.check_operation_moves_state('assigned'):
             raise exceptions.Warning(
-                _("Missing materials"),
                 _("Missing materials to start the production"))
         return super(MrpProductionWorkcenterLine, self).action_start_working()