account_move.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>

    <!-- Add a period & dates onto accounting documents. -->

    <!-- Inherit from the acc doc form view defined in "account". -->
    <record id="account_period_account_move_form" model="ir.ui.view">
        <field name="name">account_period_account_move_form</field>
        <field name="model">account.move</field>
        <field name="inherit_id" ref="account.view_move_form" />
        <field name="arch" type="xml">

            <!-- Add fields. -->
            <xpath expr="//field[@name='date']" position="before">
                <field name="period_id" options="{'no_create': 1}" />
            </xpath>
            <xpath expr="//field[@name='date']" position="after">
                <field name="transaction_date" />
            </xpath>

        </field>
    </record>

</odoo>