diff --git a/ext/custom-addons/dp_custom/models/stock.py b/ext/custom-addons/dp_custom/models/stock.py
index a34b0a19..ceb356cd 100644
--- a/ext/custom-addons/dp_custom/models/stock.py
+++ b/ext/custom-addons/dp_custom/models/stock.py
@@ -19,7 +19,9 @@
 #
 ##############################################################################
 
-from odoo import fields, models, api, tools
+from odoo import fields, models, api, tools, _
+from odoo.exceptions import ValidationError
+from odoo.tools.float_utils import float_compare, float_is_zero
 
 
 class StockProductionLot(models.Model):
@@ -61,18 +63,26 @@ class StockPicking(models.Model):
         res = lang_obj.format('%.' + str(2) + 'f', value, grouping=True, monetary=True)
         return res
 
+
 class StockMove(models.Model):
     _inherit = "stock.move"
 
     manu_lots_visible = fields.Boolean(compute='_compute_manu_lots_visible')
 
+    @api.model
+    def create(self, vals):
+        res = super(StockMove, self).create(vals)
+        for move in res:
+            move.update({'sequence': move.sale_line_id.sequence,})
+        return res
+
     @api.multi
     def _prepare_move_line_vals(self, quantity=None, reserved_quant=None):
         self.ensure_one()
         vals = super(StockMove, self)._prepare_move_line_vals(quantity=quantity, reserved_quant=reserved_quant)
         if self.sale_line_id.lot_id and not self.sale_line_id.product_id.can_be_sold_unconfigured:
             move_lot = self.sale_line_id.lot_id.id
-            vals.update({'lot_id': move_lot, })
+            vals.update({'lot_id': move_lot,})
         return vals
 
     def _compute_manu_lots_visible(self):
@@ -98,4 +108,21 @@ class StockMove(models.Model):
             else:
                 move.weight += (move.product_qty * move.product_id.weight)
 
-#        print(move.weight)
\ No newline at end of file
+#        print(move.weight)
+
+
+class StockQuant(models.Model):
+    _inherit = "stock.quant"
+
+    @api.constrains('quantity')
+    def check_quantity(self):
+        info = ''
+        for quant in self:
+            if float_compare(quant.quantity, 1, precision_rounding=quant.product_uom_id.rounding) > 0 and quant.lot_id and quant.product_id.tracking == 'serial':
+                smls = self.env['stock.move.line'].search([('lot_id', '=', quant.lot_id.id)])
+                for sml in smls:
+                    sm = self.env['stock.move'].search([('id', '=', sml.move_id.id)])
+                    info += '\n %s; %s; %s: %s' % (sm.origin,sm.reference,sm.sequence,quant.lot_id.name)
+
+        if info:
+            raise ValidationError(_('A serial number should only be linked to a single product.') + info)
diff --git a/ext/custom-addons/tz_reports_production/reports/report_production.xml b/ext/custom-addons/tz_reports_production/reports/report_production.xml
index d535a5ac..d6127694 100644
--- a/ext/custom-addons/tz_reports_production/reports/report_production.xml
+++ b/ext/custom-addons/tz_reports_production/reports/report_production.xml
@@ -129,6 +129,9 @@
                                         <strong>Voraussichtliches Lieferdatum:</strong>
                                         <span t-field="order_line.delivery_date"/>
                                     </t>
+                                    <p t-if="order_line.lot_id">
+                                        <span t-esc="order_line.lot_id.name.split('.')[2]"/>
+                                    </p>
 -->
                                     <p t-if="order_line.lot_id.notes">
                                         <span t-field="order_line.lot_id.notes"/>