account-closing/account_invoice_start_end_dates/views/account_move.xml

<?xml version="1.0" encoding="utf-8" ?>
<!--
  Copyright 2013-2020 Akretion France (http://www.akretion.com/)
  @author: Alexis de Lattre <alexis.delattre@akretion.com>
  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
-->
<flectra>
    <record id="view_move_line_form" model="ir.ui.view">
        <field name="name">start_end_dates.view_move_line_form</field>
        <field name="model">account.move.line</field>
        <field name="inherit_id" ref="account.view_move_line_form" />
        <field name="arch" type="xml">
            <field name="date_maturity" position="after">
                <field name="must_have_dates" invisible="1" />
                <field
                    name="start_date"
                    attrs="{'required': [('must_have_dates', '=', True)]}"
                />
                <field
                    name="end_date"
                    attrs="{'required': [('must_have_dates', '=', True)]}"
                />
            </field>
        </field>
    </record>
    <record id="view_move_form" model="ir.ui.view">
        <field name="name">start_end_dates.view_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="//field[@name='invoice_line_ids']/tree/field[@name='quantity']"
                position="before"
            >
                <field name="must_have_dates" invisible="1" />
                <field
                    name="start_date"
                    attrs="{'required': [('must_have_dates', '=', True)]}"
                    optional="show"
                />
                <field
                    name="end_date"
                    attrs="{'required': [('must_have_dates', '=', True)]}"
                    optional="show"
                />
            </xpath>
            <xpath
                expr="//field[@name='invoice_line_ids']/form//field[@name='analytic_tag_ids']"
                position="before"
            >
                <field name="must_have_dates" invisible="1" />
                <field
                    name="start_date"
                    attrs="{'required': [('must_have_dates', '=', True)]}"
                />
                <field
                    name="end_date"
                    attrs="{'required': [('must_have_dates', '=', True)]}"
                />
            </xpath>
            <xpath
                expr="//field[@name='line_ids']/tree/field[@name='credit']"
                position="after"
            >
                <field name="start_date" optional="hide" />
                <field name="end_date" optional="hide" />
            </xpath>
        </field>
    </record>
</flectra>