From 551d8e23ed07d2278c0fffa75d08ccacd0a5d638 Mon Sep 17 00:00:00 2001
From: mekav-odoo <mekav@odoo.com>
Date: Thu, 12 Feb 2026 11:26:56 +0530
Subject: [PATCH 1/2] [ADD] purchase: add global discount wizard

Implement a global discount feature for Purchase Orders that allows
users to apply a percentage or fixed amount discount across all
order lines via a wizard.

- Add a 'Discount' button on the purchase order form view, positioned
  above the subtotal section.
- Create a transient model 'purchase.discount.wizard' to handle
  the discount calculation logic.
- Update purchase order lines with the calculated discount when
  the wizard is confirmed.
---
 purchase_discount/__init__.py                 |  2 +
 purchase_discount/__manifest__.py             | 18 ++++++
 purchase_discount/models/__init__.py          |  1 +
 purchase_discount/models/purchase_order.py    | 15 +++++
 .../security/ir.model.access.csv              |  2 +
 .../views/purchase_order_view.xml             | 13 ++++
 purchase_discount/wizard/__init__.py          |  1 +
 .../wizard/purchase_order_discount.py         | 61 +++++++++++++++++++
 .../wizard/purchase_order_discount_view.xml   | 23 +++++++
 9 files changed, 136 insertions(+)
 create mode 100644 purchase_discount/__init__.py
 create mode 100644 purchase_discount/__manifest__.py
 create mode 100644 purchase_discount/models/__init__.py
 create mode 100644 purchase_discount/models/purchase_order.py
 create mode 100644 purchase_discount/security/ir.model.access.csv
 create mode 100644 purchase_discount/views/purchase_order_view.xml
 create mode 100644 purchase_discount/wizard/__init__.py
 create mode 100644 purchase_discount/wizard/purchase_order_discount.py
 create mode 100644 purchase_discount/wizard/purchase_order_discount_view.xml

diff --git a/purchase_discount/__init__.py b/purchase_discount/__init__.py
new file mode 100644
index 00000000000..9b4296142f4
--- /dev/null
+++ b/purchase_discount/__init__.py
@@ -0,0 +1,2 @@
+from . import models
+from . import wizard
diff --git a/purchase_discount/__manifest__.py b/purchase_discount/__manifest__.py
new file mode 100644
index 00000000000..7e603ce3315
--- /dev/null
+++ b/purchase_discount/__manifest__.py
@@ -0,0 +1,18 @@
+{
+    'name': 'purchase_dicount',
+    'description': "Add function for disscount",
+    'author': "meet kavathiya",
+    'website': "https://www.odoo.com/",
+    'category': "Real-estate",
+    'version': "0.1",
+    'application': True,
+    'installable': True,
+    'depends': ['purchase'],
+    'data': [
+        'security/ir.model.access.csv',
+        'views/purchase_order_view.xml',
+        'wizard/purchase_order_discount_view.xml'
+    ],
+    'assets': {},
+    'license': 'LGPL-3',
+}
\ No newline at end of file
diff --git a/purchase_discount/models/__init__.py b/purchase_discount/models/__init__.py
new file mode 100644
index 00000000000..9f03530643d
--- /dev/null
+++ b/purchase_discount/models/__init__.py
@@ -0,0 +1 @@
+from . import purchase_order
diff --git a/purchase_discount/models/purchase_order.py b/purchase_discount/models/purchase_order.py
new file mode 100644
index 00000000000..dc2d774dc1a
--- /dev/null
+++ b/purchase_discount/models/purchase_order.py
@@ -0,0 +1,15 @@
+from odoo import models
+
+
+class InheritedPurchaseOrder(models.Model):
+    _inherit = 'purchase.order'
+
+    def action_open_discount_wizard(self):
+        self.ensure_one()
+        return {
+            'name': "Discount",
+            'type': 'ir.actions.act_window',
+            'res_model': 'purchase.order.discount',
+            'view_mode': 'form',
+            'target': 'new',
+        }
diff --git a/purchase_discount/security/ir.model.access.csv b/purchase_discount/security/ir.model.access.csv
new file mode 100644
index 00000000000..ef7a38f3312
--- /dev/null
+++ b/purchase_discount/security/ir.model.access.csv
@@ -0,0 +1,2 @@
+id,name,model_id/id,group_id/id,perm_read,perm_write,perm_create,perm_unlink
+access_purchase_order_discount,access_purchase_order_discount,model_purchase_order_discount,base.group_user,1,1,1,1
diff --git a/purchase_discount/views/purchase_order_view.xml b/purchase_discount/views/purchase_order_view.xml
new file mode 100644
index 00000000000..e7101b31286
--- /dev/null
+++ b/purchase_discount/views/purchase_order_view.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="inherited_purchase_view_form" model="ir.ui.view">
+        <field name="name">purchase.view.form.inherit.purchase.discount</field>
+        <field name="model">purchase.order</field>
+        <field name="inherit_id" ref="purchase.purchase_order_form"/>
+        <field name="arch" type="xml">
+            <field name="tax_totals" position="after">
+                <button string="discount" name="action_open_discount_wizard" type="object" class="btn btn-secondary"/>
+            </field>
+        </field>
+    </record>
+</odoo>
diff --git a/purchase_discount/wizard/__init__.py b/purchase_discount/wizard/__init__.py
new file mode 100644
index 00000000000..510f03e2878
--- /dev/null
+++ b/purchase_discount/wizard/__init__.py
@@ -0,0 +1 @@
+from . import purchase_order_discount
diff --git a/purchase_discount/wizard/purchase_order_discount.py b/purchase_discount/wizard/purchase_order_discount.py
new file mode 100644
index 00000000000..b6ceb2ba612
--- /dev/null
+++ b/purchase_discount/wizard/purchase_order_discount.py
@@ -0,0 +1,61 @@
+from odoo import api, fields, models
+from odoo.exceptions import ValidationError
+
+
+class PurchaseOrderDiscount(models.TransientModel):
+    _name = 'purchase.order.discount'
+    _description = "Discount Wizard"
+
+    purchase_order_id = fields.Many2one(
+        'purchase.order',
+        default=lambda self: self.env.context.get('active_id'),
+        required=True,
+    )
+    discount_percentage = fields.Float(string="Percentage")
+    discount_type = fields.Selection(
+        selection=[
+            ('percentage', "%"),
+            ('amount', "₹"),
+        ],
+        default='percentage',
+    )
+    percentage = fields.Float(compute='_compute_initial_discount')
+
+    @api.constrains('discount_type', 'discount_percentage')
+    def _check_discount_amount(self):
+        for wizard in self:
+            if (
+                (wizard.discount_type in ('percentage')
+                and wizard.discount_percentage > 100.0)
+                or (wizard.discount_type in ('amount') 
+                and wizard.discount_percentage > wizard.purchase_order_id.amount_untaxed)
+            ):
+                raise ValidationError("Invalid discount amount")
+
+    @api.depends('discount_type', 'discount_percentage')
+    def _compute_initial_discount(self):
+        if self.discount_type == 'amount':
+            if self.purchase_order_id.amount_untaxed == 0:
+                raise ValidationError("No more discount possible")
+            self.percentage = (
+                self.discount_percentage * 100 / self.purchase_order_id.amount_untaxed
+            )
+        else:
+            self.percentage = self.discount_percentage
+
+    def action_apply_discount(self):
+        self.ensure_one()
+        if self.discount_type == 'amount':
+            self.purchase_order_id.order_line.write(
+                {
+                    'discount': (
+                        self.discount_percentage
+                        * 100
+                        / self.purchase_order_id.amount_untaxed
+                    )
+                }
+            )
+        else:
+            self.purchase_order_id.order_line.write(
+                {'discount': self.discount_percentage}
+            )
diff --git a/purchase_discount/wizard/purchase_order_discount_view.xml b/purchase_discount/wizard/purchase_order_discount_view.xml
new file mode 100644
index 00000000000..1d62ebbd24d
--- /dev/null
+++ b/purchase_discount/wizard/purchase_order_discount_view.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+
+    <record id="purchase_order_line_wizard_form" model="ir.ui.view">
+        <field name="name">purchase.order.discount.form</field>
+        <field name="model">purchase.order.discount</field>
+        <field name="arch" type="xml">
+            <form>
+                <sheet>
+                    <!-- <field name="purchase_order_id" invisible="1"/> -->
+                    <field name="discount_percentage" nolabel="1"/>
+                    <field name="discount_type" nolabel="1"/>
+                    <field name="percentage" class='text-muted' nolabel="1"/>
+                </sheet>
+                <footer>
+                    <button type="object" string="Apply" name="action_apply_discount" class="btn btn-primary" data-hotkey="q"/>
+                    <button special="cancel" string="Discard" class="btn btn-secondary" data-hotkey="x"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+
+</odoo>

From 7f260f8e1d673770ef375f0c5f35747cb5286c67 Mon Sep 17 00:00:00 2001
From: mekav-odoo <mekav@odoo.com>
Date: Thu, 12 Feb 2026 14:13:17 +0530
Subject: [PATCH 2/2] [FIX] purchase: discount button position

- Update a 'Discount' button position on the purchase order form view,
---
 purchase_discount/__manifest__.py                   | 2 +-
 purchase_discount/views/purchase_order_view.xml     | 8 +++++---
 purchase_discount/wizard/purchase_order_discount.py | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/purchase_discount/__manifest__.py b/purchase_discount/__manifest__.py
index 7e603ce3315..8526d99daa7 100644
--- a/purchase_discount/__manifest__.py
+++ b/purchase_discount/__manifest__.py
@@ -15,4 +15,4 @@
     ],
     'assets': {},
     'license': 'LGPL-3',
-}
\ No newline at end of file
+}
diff --git a/purchase_discount/views/purchase_order_view.xml b/purchase_discount/views/purchase_order_view.xml
index e7101b31286..0d345f71c02 100644
--- a/purchase_discount/views/purchase_order_view.xml
+++ b/purchase_discount/views/purchase_order_view.xml
@@ -5,9 +5,11 @@
         <field name="model">purchase.order</field>
         <field name="inherit_id" ref="purchase.purchase_order_form"/>
         <field name="arch" type="xml">
-            <field name="tax_totals" position="after">
-                <button string="discount" name="action_open_discount_wizard" type="object" class="btn btn-secondary"/>
-            </field>
+            <xpath expr="//field[@name='order_line']" position="after">
+                <div class="d-flex justify-content-end mt-2 mb-2">
+                    <button string="Discount" name="action_open_discount_wizard" type="object" class="btn btn-secondary"/>
+                </div>
+            </xpath>
         </field>
     </record>
 </odoo>
diff --git a/purchase_discount/wizard/purchase_order_discount.py b/purchase_discount/wizard/purchase_order_discount.py
index b6ceb2ba612..00155840fbb 100644
--- a/purchase_discount/wizard/purchase_order_discount.py
+++ b/purchase_discount/wizard/purchase_order_discount.py
@@ -27,7 +27,7 @@ def _check_discount_amount(self):
             if (
                 (wizard.discount_type in ('percentage')
                 and wizard.discount_percentage > 100.0)
-                or (wizard.discount_type in ('amount') 
+                or (wizard.discount_type in ('amount')
                 and wizard.discount_percentage > wizard.purchase_order_id.amount_untaxed)
             ):
                 raise ValidationError("Invalid discount amount")