Open form with manageable products - odoo-8

Question

In Bill Of Materials we can make product from other products. as you can see in picture 1 there is Test Product made from 2 other product.
in Sale Order line I made button that opens this form with Product Price and Qty
But the goal is to open form where i can manage products that Test Product are build from and change qty and price there.
<record id="view_order_line_form_view" model="ir.ui.view">
<field name="name">sale.order.line.forma</field>
<field name="model">sale.order.line</field>
<field name="arch" type="xml">
<form string="Sales Order Lines">
<field name="product_id" />
<field name="product_uom_qty" string="Qty" placeholder="Qty"/>
<field name="price_unit" string="Price"/>
</form>
</field>
</record>
class SaleOrderLine(models.Model):
_inherit = "sale.order.line"
#api.multi
def button_details(self):
context = self.env.context.copy()
context['view_buttons'] = True
view_id = self.env.ref('cfg.view_order_line_form_view').id
view = {
'name': _('Details'),
'view_type': 'form',
'view_mode': 'form',
'res_model': 'sale.order.line',
'views' : [(view_id,'form')],
'type': 'ir.actions.act_window',
'target': 'new',
'readonly': True,
'res_id': self.id,
'context': context
}
return view