docx_report_generation/wizard/res_partner_contract_wizard.xml

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

    <record id="res_partner_wizard_print_document_view" model="ir.ui.view">
        <field name="name">Generate Document</field>
        <field name="model">res.partner.contract.wizard</field>
        <field name="arch" type="xml">

            <form>

                <group string="Template">
                    <field name="document_template"></field>
                </group>

                <group invisible="1">
                    <!-- Need for generate a document -->
                    <field name="target"/>
                    <field name="partner_id"/>
                    <field name="company_id"/>
                </group>
                
                <button string="Create a document" type="object" name="get_docx_contract" />

                <group string="Values">
                    <field name="transient_field_ids" nolabel="1" colspan="4">
                        <tree editable="1" create="0" delete="0">
                            <field name="name"/>
                            <field name="value"/>
                            <field name="description"/>
                            <field name="technical_name" invisible="1"/>
                        </tree>
                    </field>
                    <field name="transient_field_ids_hidden" invisible="1"/>
                </group>

                <footer/>

            </form>
        </field>
    </record>

</odoo>