diff --git a/source/app/controllers/util.py b/source/app/controllers/util.py
index ffb2b7c..a203455 100644
--- a/source/app/controllers/util.py
+++ b/source/app/controllers/util.py
@@ -740,6 +740,7 @@ class LIBO(object):
 
     def _conceptos(self, data):
         first = True
+        copy = False
         for concepto in data:
             key = concepto.get('noidentificacion', '')
             description = concepto['descripcion']
@@ -757,18 +758,14 @@ class LIBO(object):
                 cell_6 = self._set_cell('{importe}', importe, value=True)
             else:
                 row = cell_2.getCellAddress().Row + 1
-                self._sheet.getRows().insertByIndex(row, 1)
-                if cell_1:
-                    self._copy_cell(cell_1)
-                    cell_1 = self._set_cell(v=key, cell=cell_1)
-                if cell_3:
-                    self._copy_cell(cell_3)
-                    cell_3 = self._set_cell(v=unidad, cell=cell_3)
-                self._copy_cell(cell_2)
-                self._copy_cell(cell_4)
-                self._copy_cell(cell_5)
-                self._copy_cell(cell_6)
+                if not copy:
+                    self._sheet.getRows().insertByIndex(row, len(data)-1)
+                    copy = True
+                source = self._sheet.getRows().getByIndex(row - 1)
+                cell_1 = self._set_cell(v=key, cell=cell_1)
+                self._sheet.copyRange(cell_1.getCellAddress(), source.getRangeAddress())
                 cell_2 = self._set_cell(v=description, cell=cell_2)
+                cell_3 = self._set_cell(v=unidad, cell=cell_3)
                 cell_4 = self._set_cell(v=cantidad, cell=cell_4, value=True)
                 cell_5 = self._set_cell(v=valor_unitario, cell=cell_5, value=True)
                 cell_6 = self._set_cell(v=importe, cell=cell_6, value=True)
diff --git a/source/app/main.ini.example b/source/app/main.ini.example
index 77a5d54..9f37e02 100644
--- a/source/app/main.ini.example
+++ b/source/app/main.ini.example
@@ -15,4 +15,5 @@ thunder-lock = true
 #~ stats = 127.0.0.1:9191
 #~ Establece una ruta accesible para el servidor web
 logger = file:/srv/log/empresalibre-uwsgi.log
-log-maxsize = 1000000
\ No newline at end of file
+log-maxsize = 1000000
+http-timeout = 180
\ No newline at end of file
diff --git a/source/app/main_debug.ini b/source/app/main_debug.ini
index 043ea43..94481fe 100644
--- a/source/app/main_debug.ini
+++ b/source/app/main_debug.ini
@@ -8,3 +8,4 @@ threads = 4
 py-autoreload = 1
 thunder-lock = true
 static-map = /static=../static
+http-timeout = 120
\ No newline at end of file
diff --git a/source/app/models/db.py b/source/app/models/db.py
index cf12c63..302db1a 100644
--- a/source/app/models/db.py
+++ b/source/app/models/db.py
@@ -25,6 +25,9 @@ class StorageEngine(object):
             return getattr(self, '_get_{}'.format(table))(values, session)
         return getattr(self, '_get_{}'.format(table))(values)
 
+    def _get_canopenpre(self, values):
+        return main.PreFacturasDetalle.can_open(values['id'])
+
     def _get_importinvoice(self, values):
         return main.import_invoice()
 
diff --git a/source/app/models/main.py b/source/app/models/main.py
index cc064b1..c439a45 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -3534,6 +3534,44 @@ class PreFacturas(BaseModel):
     class Meta:
         order_by = ('fecha',)
 
+    @util.run_in_thread
+    def _send_in_thread(self, id, obj, values):
+        log.info('Generando PDF...')
+        files = (self.get_pdf(id),)
+        log.info('PDF Generado...')
+
+        invoice = PreFacturas.select().where(PreFacturas.id==id).dicts()[0]
+        fields = {
+            'receptor_nombre': obj.cliente.nombre,
+            'receptor_rfc': obj.cliente.rfc,
+        }
+        fields.update(invoice)
+
+        asunto = 'Enviamos la prefactura: PRE-{}'.format(obj.folio)
+        server = {
+            'servidor': values['correo_servidor'],
+            'puerto': values['correo_puerto'],
+            'ssl': bool(int(values['correo_ssl'])),
+            'usuario': values['correo_usuario'],
+            'contra': values['correo_contra'],
+        }
+        options = {
+            'para': obj.cliente.correo_facturas,
+            'copia': values['correo_copia'],
+            'confirmar': util.get_bool(values.get('correo_confirmacion', '0')),
+            'asunto': asunto,
+            'mensaje': util.make_info_mail(values['correo_mensaje'], fields),
+            'files': files,
+        }
+        data= {
+            'server': server,
+            'options': options,
+        }
+        log.info('Enviando prefactura...')
+        result = util.send_mail(data)
+        log.info('Prefactura enviada...')
+        return
+
     @classmethod
     def enviar(cls, id):
         values = Configuracion.get_({'fields': 'correo'})
@@ -3546,6 +3584,12 @@ class PreFacturas(BaseModel):
             msg = 'El cliente no tiene configurado el correo para facturas'
             return {'ok': False, 'msg': msg}
 
+        rows = PreFacturasDetalle.count(id)
+        if rows > 300:
+            cls._send_in_thread(cls, id, obj, values)
+            msg = 'Enviando correo...'
+            return {'ok': True, 'msg': msg}
+
         files = (cls.get_pdf(id),)
 
         invoice = PreFacturas.select().where(PreFacturas.id==id).dicts()[0]
@@ -3661,6 +3705,25 @@ class PreFacturas(BaseModel):
 
         return data
 
+    @util.run_in_thread
+    def _get_pdf_in_thread(self, id):
+        obj = PreFacturas.get(PreFacturas.id==id)
+        name = '{}{}_{}.pdf'.format(obj.serie, obj.folio, obj.cliente.rfc)
+        data = self._get_info_to_pdf(self, id)
+        doc = util.to_pdf(data, data['emisor']['rfc'])
+
+        emisor = Emisor.select()[0]
+        target = emisor.rfc + '/Prefacturas/'
+        files = (
+            (doc, name, target),
+        )
+        util.sync_cfdi({'REPO': False}, files)
+        return
+
+    @classmethod
+    def get_pdf_in_thread(cls, id):
+        return cls._get_pdf_in_thread(cls, id)
+
     @classmethod
     def get_pdf(cls, id):
         obj = PreFacturas.get(PreFacturas.id==id)
@@ -4008,6 +4071,21 @@ class PreFacturasDetalle(BaseModel):
 
         return {'rows': data, 'receptor': receptor}
 
+    @classmethod
+    def count(cls, id):
+        c = PreFacturasDetalle.select().where(
+            PreFacturasDetalle.factura==id).count()
+        return c
+
+    @classmethod
+    def can_open(cls, id):
+        c = cls.count(id)
+        # ~ result = c < 300
+        # ~ if result:
+            # ~ return True
+        PreFacturas.get_pdf_in_thread(id)
+        return c < 300
+
     @classmethod
     def get_(cls, id):
         data = []
diff --git a/source/static/js/controller/invoices.js b/source/static/js/controller/invoices.js
index 4bc2f6f..db54fe8 100644
--- a/source/static/js/controller/invoices.js
+++ b/source/static/js/controller/invoices.js
@@ -1543,12 +1543,26 @@ function enviar_prefactura(id){
 }
 
 
-function grid_preinvoices_click(id, e, node){
-    //~ var row = this.getItem(id)
+function generate_pdf(id){
+    webix.ajax().get('/values/canopenpre', {id: id}, {
+        error: function(text, data, xhr) {
+        },
+        success: function(text, data, xhr) {
+            var value = data.json();
+            //~ if(value){
+            window.open('/doc/pre/' + id, '_blank')
+            //~ }else{
+                //~ msg_ok('Generando prefactura...')
+            //~ }
+        }
+    })
 
+}
+
+
+function grid_preinvoices_click(id, e, node){
     if(id.column == 'pdf'){
-        //~ location = '/doc/pre/' + row.id
-        window.open('/doc/pre/' + id, '_blank')
+        generate_pdf(id.row)
     }else if(id.column == 'email'){
         enviar_prefactura(id)
     }
@@ -1895,21 +1909,6 @@ function cmd_upload_invoice_click(){
 
 
 function add_import_product_taxes(taxes){
-    //~ var taxes = values.taxes
-    //~ var row = grid.getItem(values.id)
-
-    //~ values['delete'] = '-'
-    //~ if (row == undefined){
-        //~ grid.add(values)
-    //~ } else {
-        //~ values['cantidad'] = parseFloat(row.cantidad) + parseFloat(values['cantidad'])
-        //~ values['valor_unitario'] = parseFloat(row.valor_unitario)
-        //~ values['descuento'] = parseFloat(row.descuento)
-        //~ var precio_final = values['valor_unitario'] - values['descuento']
-        //~ values['importe'] = (precio_final * values['cantidad']).round(DECIMALES)
-        //~ grid.updateItem(row.id, values)
-    //~ }
-
     for(var v of taxes){
         var pt = table_pt.findOne(v)
         if(pt === null){
diff --git a/source/templates/plantilla_factura.ods b/source/templates/plantilla_factura.ods
index e439792..3e50e6b 100644
Binary files a/source/templates/plantilla_factura.ods and b/source/templates/plantilla_factura.ods differ