diff --git a/purchase_lot/__manifest__.py b/purchase_lot/__manifest__.py
index c8124de0ce3..f35940e2d88 100644
--- a/purchase_lot/__manifest__.py
+++ b/purchase_lot/__manifest__.py
@@ -3,7 +3,7 @@
 
 {
     "name": "Purchase Lot",
-    "version": "16.0.1.0.0",
+    "version": "17.0.1.0.0",
     "category": "Purchase",
     "license": "AGPL-3",
     "author": "Akretion, Odoo Community Association (OCA)",
diff --git a/purchase_lot/models/purchase_order_line.py b/purchase_lot/models/purchase_order_line.py
index d696692fc37..3a9c2f6a24d 100644
--- a/purchase_lot/models/purchase_order_line.py
+++ b/purchase_lot/models/purchase_order_line.py
@@ -8,9 +8,7 @@
 class PurchaseOrderLine(models.Model):
     _inherit = "purchase.order.line"
 
-    lot_id = fields.Many2one(
-        "stock.lot", string="Serial Number", readonly=True, copy=False
-    )
+    lot_id = fields.Many2one("stock.lot", string="Serial Number", copy=False)
 
     @api.model
     def _prepare_purchase_order_line_from_procurement(
@@ -46,7 +44,7 @@ def _find_candidate(
         values,
     ):
         lot_id = values.get("restrict_lot_id", False)
-        self = self.filtered(lambda l: l.lot_id.id == lot_id)
+        self = self.filtered(lambda line: line.lot_id.id == lot_id)
         return super()._find_candidate(
             product_id,
             product_qty,
diff --git a/purchase_lot/tests/test_purchase_lot.py b/purchase_lot/tests/test_purchase_lot.py
index 4fc2c5d8827..e4be9a41edf 100644
--- a/purchase_lot/tests/test_purchase_lot.py
+++ b/purchase_lot/tests/test_purchase_lot.py
@@ -84,7 +84,9 @@ def test_purchase_lot(self):
         )
         # not merged because of different lot
         self.assertEqual(len(pols), 2)
-        pol1 = pols.filtered(lambda l: l.move_dest_ids.restrict_lot_id.id == lot1.id)
+        pol1 = pols.filtered(
+            lambda line: line.move_dest_ids.restrict_lot_id.id == lot1.id
+        )
         self.assertEqual(pol1.lot_id.id, lot1.id)
         pol1.order_id.button_confirm()
         self.assertEqual(pol1.move_ids.restrict_lot_id.id, lot1.id)
diff --git a/purchase_lot/views/purchase_order_view.xml b/purchase_lot/views/purchase_order_view.xml
index f7574afd5cc..7879539ba5d 100644
--- a/purchase_lot/views/purchase_order_view.xml
+++ b/purchase_lot/views/purchase_order_view.xml
@@ -9,7 +9,7 @@
                 expr="//field[@name='order_line']/tree/field[@name='name']"
                 position="after"
             >
-                    <field name="lot_id" />
+                    <field name="lot_id" readonly="1" />
                 </xpath>
             </field>
         </record>
@@ -19,7 +19,7 @@
             <field name="inherit_id" ref="purchase.purchase_order_line_form2" />
                 <field name="arch" type="xml">
                     <xpath expr="//field[@name='product_id']" position="after">
-                    <field name="lot_id" />
+                    <field name="lot_id" readonly="1" />
                 </xpath>
             </field>
         </record>