stock-logistics-warehouse/stock_quant_manual_assign/views/stock_move_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record model="ir.ui.view" id="stock_move_manual_quants_form_view">
            <field name="name">stock.move.form</field>
            <field name="model">stock.move</field>
            <field name="inherit_id" ref="stock.view_move_form" />
            <field name="arch" type="xml">
                <button name="force_assign" position="after">
                    <button name="%(assign_manual_quants_action)d" states="assigned" string="Manual Quants" type="action" class="oe_highlight"/>
                </button>
            </field>
        </record>

    </data>
</openerp>