Hey i have a view in which a line view when clicked also has a form view which pops up. I want to xpath a field inside that popping form but unable to do so . here is the code

<page string="Products">
    <field name="line_ids">
        <tree decoration-muted="cancelled == True">
            <field name="product_id"/>
            <field name="name"/>             
<field name="is_editable" invisible="1"/>
 </tree>
 <form>
 <sheet>
 <group>
 <group>
 <field name="is_editable" invisible="1"/>
 <field name="product_id"
attrs="{'readonly': [('is_editable','=', False)]}"/>
 <field name="name"
attrs="{'readonly': [('is_editable','=', False)]}"/>
 <label for="product_qty"
attrs="{'readonly': [('is_editable','=', False)]}"/>
 <div>
 <field name="product_qty"
class="oe_inline"
attrs="{'readonly': [('is_editable','=', False)]}"/>
More or less this is what it looks like.