I want to update the existing Sales Order Line tree view that is embedded in the default Odoo 9 Sales Order form view to hide a row based on a condition of the sales order line. 

View being modified: sale.view_order_form

<notebook>
    <page string="Order Lines">
        <field name="order_line" mode="tree,kanban" attrs="{'readonly': [('state', 'in', ('done','cancel'))]}">
        ...
        <tree string="Sales Order Lines" editable="bottom" decoration-info="invoice_status=='to invoice'">
	        <field name="sequence" widget="handle"/>
	        <field name="product_id"/>
	        <field name="name"/>
        	...
        	<field name="is_delivery" invisible="1"/>
        	...

Generally, there is only one item which "is_delivery", so I still want to see the rest of the items for the order.

I have tried using domain and attrs but so far I haven't had any success whatsoever. I think it is because the view is using the sale.order model, but the embedded tree view is using records from sale.order.line?

How can I hide the line item if "is_delivery" is True?