[16.0][IMP] sale_order_line_cancel: Allow to decrease product_uom_qty on line cancel

sale_order_line_cancel/__manifest__.py

@@ -17,6 +17,7 @@
         "wizards/sale_order_line_cancel.xml",
         "views/sale_order.xml",
         "views/sale_order_line.xml",
+        "views/res_config_settings_views.xml",
     ],
     "website": "https://github.com/OCA/sale-workflow",
     "pre_init_hook": "pre_init_hook",

sale_order_line_cancel/models/__init__.py

@@ -1,3 +1,5 @@
 from . import sale_order_line
 from . import stock_move
 from . import sale_order
+from . import res_company
+from . import res_config_settings

sale_order_line_cancel/models/res_company.py

@@ -0,0 +1,13 @@
+# Copyright 2025 Michael Tietz (MT Software) <mtietz@mt-software.de>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+from odoo import fields, models
+
+
+class ResCompany(models.Model):
+    _inherit = "res.company"
+
+    on_sale_line_cancel_decrease_line_qty = fields.Boolean(
+        "On sale order line cancel decrease line quantity",
+        help="On canceling the remaining qty to deliver of an order line "
+        "it decreases the initial quantity",
+    )

sale_order_line_cancel/models/res_config_settings.py

@@ -0,0 +1,11 @@
+# Copyright 2025 Michael Tietz (MT Software) <mtietz@mt-software.de>
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
+from odoo import fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = "res.config.settings"
+
+    on_sale_line_cancel_decrease_line_qty = fields.Boolean(
+        related="company_id.on_sale_line_cancel_decrease_line_qty", readonly=False
+    )

sale_order_line_cancel/models/sale_order_line.py

@@ -1,6 +1,7 @@
 # Copyright 2018 Okia SPRL
 # Copyright 2018 Jacques-Etienne Baudoux (BCIM) <je@bcim.be>
 # Copyright 2020 ACSONE SA/NV
+# Copyright 2025 Michael Tietz (MT Software) <mtietz@mt-software.de>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 from odoo import _, api, fields, models
@@ -41,7 +42,7 @@ def _compute_can_cancel_remaining_qty(self):
     @api.depends("qty_to_deliver", "product_qty_canceled")
     def _compute_product_qty_remains_to_deliver(self):
         for line in self:
-            qty_remaining = line.qty_to_deliver - line.product_qty_canceled
+            qty_remaining = max(0, line.qty_to_deliver - line.product_qty_canceled)
             line.product_qty_remains_to_deliver = qty_remaining
 
     def _get_moves_to_cancel(self):
@@ -57,7 +58,14 @@ def _update_qty_canceled(self):
         for line in self:
             if line._get_moves_to_cancel():
                 continue
-            line.product_qty_canceled = line.qty_to_deliver
+            qty_to_deliver = line.qty_to_deliver
+            vals = {"product_qty_canceled": qty_to_deliver}
+            if (
+                line.state == "sale"
+                and line.company_id.on_sale_line_cancel_decrease_line_qty
+            ):
+                vals["product_uom_qty"] = line.qty_delivered
+            line.write(vals)
 
     def cancel_remaining_qty(self):
         lines = self.filtered(lambda l: l.can_cancel_remaining_qty)

sale_order_line_cancel/tests/test_sale_order_line_cancel.py

@@ -1,4 +1,5 @@
 # Copyright 2023 ACSONE SA/NV
+# Copyright 2025 Michael Tietz (MT Software) <mtietz@mt-software.de>
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
 
 
@@ -140,3 +141,28 @@ def test_sent_sale_order_with_picking_cancel(self):
         self.assertEqual(sale.order_line.product_qty_canceled, 0)
         self.assertEqual(sale.order_line.qty_to_deliver, 10)
         self.assertEqual(sale.order_line.product_qty_remains_to_deliver, 10)
+
+    def test_cancel_decrease_product_uom_qty(self):
+        sale = self.sale
+        sale.company_id.on_sale_line_cancel_decrease_line_qty = True
+        sale.with_context(disable_cancel_warning=True).action_cancel()
+        sale.picking_ids.unlink()
+        sale.action_draft()
+        sale.action_confirm()
+        line = self.sale.order_line
+        self.assertEqual(line.product_uom_qty, 10)
+        ship = self.sale.picking_ids
+        ship.action_assign()
+        ship.move_ids.move_line_ids.qty_done = 4
+        ship.with_context(cancel_backorder=False)._action_done()
+        moves_before = self.env["stock.move"].search([])
+        self.wiz.with_context(
+            active_id=line.id, active_model="sale.order.line"
+        ).cancel_remaining_qty()
+        moves_after = moves_before.search([("id", "not in", moves_before.ids)])
+        self.assertFalse(moves_after)
+        self.assertEqual(line.product_qty_canceled, 6)
+        self.assertEqual(line.product_qty_remains_to_deliver, 0)
+        self.assertEqual(line.qty_to_deliver, 0)
+        self.assertEqual(line.qty_delivered, 4)
+        self.assertEqual(line.product_uom_qty, 4)

sale_order_line_cancel/views/res_config_settings_views.xml

@@ -0,0 +1,26 @@
+<?xml version='1.0' encoding='utf-8' ?>
+<odoo>
+    <record id="res_config_settings_form_view" model="ir.ui.view">
+        <field name="name">res.config.settings.form.view</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id" ref="sale.res_config_settings_view_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//div[@id='proforma_configuration']" position="after">
+                <div
+                    class="col-12 col-lg-6 o_setting_box"
+                    id="line_cancel_decrease_qty_configuration"
+                >
+                    <div class="o_setting_left_pane">
+                        <field name="on_sale_line_cancel_decrease_line_qty" />
+                    </div>
+                    <div class="o_setting_right_pane">
+                        <label for="on_sale_line_cancel_decrease_line_qty" />
+                        <div class="text-muted">
+                            On canceling the remaining qty to deliver of an order line it decreases the initial quantity
+                        </div>
+                    </div>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo>