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

add_pricelist_price/__init__.py

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+from . import models

add_pricelist_price/__manifest__.py

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+{
+    'name': 'Add pricelist price',
+    'version': '0.1.0',
+    'description': 'Add pricelist price field.',
+    'depends': [
+        'sale', 'account'
+    ],
+    'data': [
+        'views/sale_order_line_views.xml',
+        'views/account_move_views.xml'
+    ],
+    'author': 'Ishwar Goswami',
+    'license': 'LGPL-3',
+    'installable': True
+}

add_pricelist_price/models/__init__.py

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+from . import sale_order_line
+from . import account_move_line

add_pricelist_price/models/account_move_line.py

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+from odoo import api, fields, models
+
+
+class AccountMoveLine(models.Model):
+    _inherit = 'account.move.line'
+
+    book_price = fields.Monetary(
+        string="Book Price",
+        compute="_compute_book_price",
+        readonly=True,
+    )
+
+    @api.depends('product_id', 'quantity', 'move_id.partner_id')
+    def _compute_book_price(self):
+        for line in self:
+            if not line.product_id:
+                line.book_price = 0.0
+                continue
+
+            if line.sale_line_ids:
+                pricelist = line.sale_line_ids[0].order_id.pricelist_id
+            else:
+                pricelist = line.move_id.partner_id.property_product_pricelist
+
+            if pricelist:
+                line.book_price = pricelist._get_product_price(
+                    product=line.product_id,
+                    quantity=line.quantity,
+                )
+            else:
+                line.book_price = line.product_id.list_price

add_pricelist_price/models/sale_order_line.py

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+from odoo import api, fields, models
+
+
+class SaleOrderLine(models.Model):
+    _inherit = ["sale.order.line"]
+
+    book_price = fields.Monetary(compute="_compute_book_price", readonly=True)
+
+    @api.depends('order_id.pricelist_id', 'product_id', 'product_uom_qty')
+    def _compute_book_price(self):
+        for line in self:
+            if not line.product_id:
+                line.book_price = 0
+                continue
+            pricelist = line.order_id.pricelist_id
+            if line.product_id and pricelist:
+                line.book_price = pricelist._get_product_price(
+                    product=line.product_id,
+                    quantity=line.product_uom_qty,
+                )
+            else:
+                line.book_price = line.product_id.lst_price

add_pricelist_price/views/account_move_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="view_move_form" model="ir.ui.view">
+        <field name="name">account.move.form</field>
+        <field name="model">account.move</field>
+        <field name="inherit_id" ref="account.view_move_form"/>
+        <field name="arch" type="xml">
+            <xpath expr="//notebook//page//list//field[@name='price_unit']" position="before">
+                <field name="book_price" column_invisible="parent.move_type != 'out_invoice'"/>
+            </xpath>
+        </field>
+    </record>
+</odoo>

add_pricelist_price/views/sale_order_line_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="sale_order_line_view_form_inherit" model="ir.ui.view">
+        <field name="name">sale.order.form.inherit.book.price</field>
+        <field name="model">sale.order</field>
+        <field name="inherit_id" ref="sale.view_order_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//notebook//page//list//field[@name='product_uom_qty']" position="after">
+                <field name="book_price" />
+            </xpath>
+        </field>
+    </record>
+</odoo>