account-tools/account_partner_account_number/views/account_move_views.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <record id="view_move_line_tree_inherit_account_code" model="ir.ui.view">
        <field name="name">account.move.line.tree.inherit.account.number</field>
        <field name="model">account.move.line</field>
        <field eval="100" name="priority"/>
        <field name="inherit_id" ref="account.view_move_line_tree" />
        <field name="arch" type="xml">
            <xpath expr="//field[@name='partner_id']" position="after">
                <field name="account_code" />
            </xpath>
        </field>
    </record>
</odoo>