diff --git a/addons/mrp/i18n/mrp.pot b/addons/mrp/i18n/mrp.pot
index 5123568e86d..c85998a4bc1 100644
--- a/addons/mrp/i18n/mrp.pot
+++ b/addons/mrp/i18n/mrp.pot
@@ -3249,6 +3249,12 @@ msgstr ""
 msgid "You cannot cancel a move move having already consumed material"
 msgstr ""
 
+#. module: mrp
+#: code:addons/mrp/models/stock_move.py:40
+#, python-format
+msgid "You cannot use the same serial number in two different lines."
+msgstr ""
+
 #. module: mrp
 #: code:addons/mrp/wizard/change_production_qty.py:44
 #, python-format
diff --git a/addons/mrp/models/stock_move.py b/addons/mrp/models/stock_move.py
index 3c6a99fa6eb..608d11e9bce 100644
--- a/addons/mrp/models/stock_move.py
+++ b/addons/mrp/models/stock_move.py
@@ -28,6 +28,16 @@ class StockMoveLots(models.Model):
     done_move = fields.Boolean('Move Done', related='move_id.is_done', store=True)  # TDE FIXME: naming
     plus_visible = fields.Boolean("Plus Visible", compute='_compute_plus')
 
+    @api.one
+    @api.constrains('lot_id')
+    def _check_lot_id(self):
+        if self.move_id.product_id.tracking == 'serial':
+            lots = set([])
+            for move_lot in self.move_id.move_lot_ids.filtered(lambda r: not r.lot_produced_id):
+                if move_lot.lot_id in lots:
+                    raise exceptions.UserError(_('You cannot use the same serial number in two different lines.'))
+                lots.add(move_lot.lot_id)
+
     def _compute_plus(self):
         for movelot in self:
             if movelot.move_id.product_id.tracking == 'serial':
diff --git a/addons/mrp/wizard/mrp_product_produce.py b/addons/mrp/wizard/mrp_product_produce.py
index f6a70c4a1f6..b7cd863a5fc 100644
--- a/addons/mrp/wizard/mrp_product_produce.py
+++ b/addons/mrp/wizard/mrp_product_produce.py
@@ -125,8 +125,8 @@ class MrpProductProduce(models.TransientModel):
                         #Possibly the entire move is selected
                         remaining_qty = movelots.quantity - movelots.quantity_done
                         if remaining_qty > 0:
-                            new_move_lot = movelots.copy()
-                            new_move_lot.write({'quantity':movelots.quantity_done, 'lot_produced_id': self.lot_id.id})
+                            default = {'quantity': movelots.quantity_done, 'lot_produced_id': self.lot_id.id}
+                            new_move_lot = movelots.copy(default=default)
                             movelots.write({'quantity': remaining_qty, 'quantity_done': 0})
                         else:
                             movelots.write({'lot_produced_id': self.lot_id.id})