[ADD] sale_pricelist: add book price to sale order and invoice lines

sale_pricelist/__init__.py

@@ -0,0 +1 @@
+from . import models

sale_pricelist/__manifest__.py

@@ -0,0 +1,18 @@
+{
+    'author': 'Odoo S.A.',
+    'name': 'Sale Pricelist',
+    'description': """
+    Add a "Book Price" field on Sales Order Lines and Invoice Lines to display the original
+    pricelist price of a product. This helps users compare the standard pricelist amount
+    with any manually adjusted line price, ensuring pricing transparency and better control
+    over discount or custom price modifications.
+    """,
+    'depends': ['sale_management'],
+    'license': 'LGPL-3',
+    'data': [
+        'views/sale_order_views.xml',
+        'views/account_move_views.xml',
+    ],
+    'application': True,
+    'installable': True
+}

sale_pricelist/models/__init__.py

@@ -0,0 +1,2 @@
+from . import sale_order_line
+from . import account_move_line

sale_pricelist/models/account_move_line.py

@@ -0,0 +1,7 @@
+from odoo import fields, models
+
+
+class AccountMoveLine(models.Model):
+    _inherit = "account.move.line"
+
+    book_price = fields.Float(related="sale_line_ids.book_price", readonly=True)

sale_pricelist/models/sale_order_line.py

@@ -0,0 +1,17 @@
+from odoo import models, fields, api
+
+
+class SaleOrderLine(models.Model):
+    _inherit = "sale.order.line"
+
+    book_price = fields.Float(compute="_compute_pricelist", readonly=True)
+
+    @api.depends("product_id", "product_uom_qty", "order_id.pricelist_id", "product_template_id.list_price")
+    def _compute_pricelist(self):
+        for record in self:
+            if not record.product_id:
+                record.book_price = 0.0
+            elif not record.order_id.pricelist_id:
+                record.book_price = record.product_template_id.list_price
+            else:
+                record.book_price = record.order_id.pricelist_id._get_product_price(record.product_id, record.product_uom_qty)

sale_pricelist/views/account_move_views.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<odoo>
+    <record id="view_move_form" model="ir.ui.view">
+        <field name="name">account.move.view.form.inherit</field>
+        <field name="model">account.move</field>
+        <field name="inherit_id" ref="account.view_move_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='quantity']" position="before">
+                <field name="book_price" invisible="move_type != 'out_invoice'"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>

sale_pricelist/views/sale_order_views.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0"?>
+<odoo>
+    <record id="sale_order_from_pricelist" model="ir.ui.view">
+        <field name="name">sale.order.view.form.inherit</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//list//field[@name='product_uom_qty']" position="before">
+                <field name="book_price"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>