[UPD] reintroduce fields on sale and invoice

__init__.py

+from . import models

models/__init__.py

+from . import account
+from . import res_users
+from . import sale

models/account.py

+# Copyright 2021- Le Filament (https://le-filament.com)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models
+
+
+class AccountInvoice(models.Model):
+    _inherit = "account.move"
+
+    # ------------------------------------------------------
+    # Fields declaration
+    # ------------------------------------------------------
+    user_second_ids = fields.Many2many(
+        comodel_name="res.users",
+        column1="invoice_id",
+        column2="user_id",
+        string="Spécialistes",
+        track_visibility="onchange",
+        copy=False,
+    )
+    user_provider_id = fields.Many2one(
+        "res.partner", string="Apporteur", track_visibility="onchange", copy=False
+    )
+
+    # ------------------------------------------------------
+    # SQL Constraints
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Default methods
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Computed fields / Search Fields
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Onchange / Constraints
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # CRUD methods (ORM overrides)
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Actions
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Business methods
+    # ------------------------------------------------------

models/res_users.py

+# Copyright 2021- Le Filament (https://le-filament.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models
+
+
+class ResUsers(models.Model):
+    _inherit = "res.users"
+
+    # ------------------------------------------------------
+    # Fields declaration
+    # ------------------------------------------------------
+    order_second_ids = fields.Many2many(
+        comodel_name="sale.order",
+        column1="user_id",
+        column2="order_id",
+        string="Commandes",
+        copy=False,
+    )
+    invoice_second_ids = fields.Many2many(
+        comodel_name="account.move",
+        column1="user_id",
+        column2="invoice_id",
+        string="Factures",
+        copy=False,
+    )

models/sale.py

+# Copyright 2021- Le Filament (https://le-filament.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models
+
+
+class SaleOrder(models.Model):
+    _inherit = "sale.order"
+
+    # ------------------------------------------------------
+    # Fields declaration
+    # ------------------------------------------------------
+    user_second_ids = fields.Many2many(
+        comodel_name="res.users",
+        column1="order_id",
+        column2="user_id",
+        string="Spécialistes",
+        track_visibility="onchange",
+        copy=False,
+    )
+    user_provider_id = fields.Many2one(
+        "res.partner", string="Apporteur", track_visibility="onchange", copy=False
+    )
+
+    # ------------------------------------------------------
+    # SQL Constraints
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Default methods
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Computed fields / Search Fields
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Onchange / Constraints
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # CRUD methods (ORM overrides)
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Actions
+    # ------------------------------------------------------
+
+    # ------------------------------------------------------
+    # Business methods
+    # ------------------------------------------------------
+    def _prepare_invoice(self):
+        values = super()._prepare_invoice()
+        values.update(
+            {
+                "user_second_ids": fields.Command.create(self.user_second_ids.ids),
+                "user_provider_id": self.user_provider_id.id or False,
+            }
+        )
+        return values

views/account_views.xml

+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2019- Le Filament (https://le-filament.com)
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+<odoo>
+	<record id="account_move_3ad_form" model="ir.ui.view">
+	    <field name="name">account.3a.move.form</field>
+	    <field name="model">account.move</field>
+	    <field name="inherit_id" ref="account.view_move_form" />
+	    <field name="arch" type="xml">
+		<field name="invoice_user_id" position="after">
+		    <field
+                    name="user_second_ids"
+                    options="{'no_create_edit': 1}"
+                    widget="many2many_tags"
+                />
+		    <field name="user_provider_id" options="{'no_create_edit': 1}" />
+		</field>
+	    </field>
+	</record>
+</odoo>

views/sale_views.xml

+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright 2019- Le Filament (https://le-filament.com)
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+<odoo>
+        <record id="view_order_form" model="ir.ui.view">
+            <field name="name">sale.3a.order.form</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[@name='other_information']//group//group//field[@name='user_id']"
+                position="after"
+            >
+                    <field
+                    name="user_second_ids"
+                    options="{'no_create_edit': 1}"
+                    widget="many2many_tags"
+                />
+                    <field
+                    name="user_provider_id"
+                    options="{'no_create_edit': 1}"
+                />
+                </xpath>
+            </field>
+        </record>
+</odoo>