[FIX] stock:Creating new lots when option "use only existing lots" is activated

When the field use_create_lots is set to False in a picking type, it is not possible
to create lot for a pack operation linked to this picking type.

opw:744862

addons/stock/i18n/stock.pot

@@ -6596,6 +6596,12 @@ msgid "You cannot set a negative product quantity in an inventory line:\n"
 "	%s - qty: %s"
 msgstr ""
 
+#. module: stock
+#: code:addons/stock/models/stock_production_lot.py:37
+#, python-format
+msgid "You are not allowed to create a lot for this picking type"
+msgstr ""
+
 #. module: stock
 #: code:addons/stock/models/stock_move.py:919
 #, python-format

addons/stock/models/stock_production_lot.py

@@ -2,6 +2,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
 from odoo import api, fields, models, _
+from odoo.exceptions import UserError
 
 
 class ProductionLot(models.Model):
@@ -27,6 +28,15 @@ class ProductionLot(models.Model):
         ('name_ref_uniq', 'unique (name, product_id)', 'The combination of serial number and product must be unique !'),
     ]
 
+    @api.model
+    def create(self, vals):
+        pack_id = self.env.context.get('active_pack_operation', False)
+        if pack_id:
+            pack = self.env['stock.pack.operation'].browse(pack_id)
+            if pack.picking_id and not pack.picking_id.picking_type_id.use_create_lots:
+                raise UserError(_("You are not allowed to create a lot for this picking type"))
+        return super(ProductionLot, self).create(vals)
+
     @api.one
     @api.depends('quant_ids.qty')
     def _product_qty(self):

addons/stock/views/stock_pack_operation_views.xml

@@ -85,7 +85,7 @@
                             <field name="lot_name" invisible="not context.get('only_create', False)"/>
                             <field name="lot_id" invisible="context.get('only_create', False)"
                                    domain="[('product_id','=', parent.product_id)]"
-                                   context="{'default_product_id': parent.product_id}"/>
+                                   context="{'default_product_id': parent.product_id, 'active_pack_operation': parent.id}"/>
                             <field name="qty_todo" invisible="not context.get('show_reserved') or context.get('serial') or context.get('state_done')" readonly="1"/>
                             <field name="qty" invisible="context.get('serial')"/>
                             <button name="do_minus" type="object" icon="fa-minus-square" attrs="{'invisible': [('qty', '&lt;=', 0.99)]}" invisible="not context.get('show_reserved') or context.get('state_done')"/>