contract/analytic_hours_block/product_view.xml

<?xml version="1.0" ?>
<openerp>
    <data>

        <record id="view_product_hours_block_form" model="ir.ui.view">
            <field name="name">product.product.block.form</field>
            <field name="model">product.product</field>
            <field name="inherit_id" ref="product.product_normal_form_view"/>
            <field name="arch" type="xml">
                <div name="options" position="inside">
                    <field name="is_in_hours_block"/>
                    <label for="is_in_hours_block"/>
                </div>
            </field>
        </record>

    </data>
</openerp>