In a tree view inside a page, I need to show a column depending on a certain field. There is a transport field whose value can either be 'air' or 'ocean'. If 'air', I need to show the 'flight_no' column in the tree view, if it is 'ocean', I need to show 'voyage_no' instead.

Here is the current code snippet of the view, which is correct if it is ocean:

<page string="Routes"> 
   <field name="freight_routes" nolabel="1" widget="one2many_list" context="{'shipper_id':shipper_id, 'consignee_id':consignee_id}"> 
      <form> 
         <sheet> 
            ... 
            <group> 
               <group> 
                  <field name="transport" widget="radio" options="{'horizontal': true}"/> 
               </group> 
            <group> 
         </sheet> 
      </form> 
      <tree> 
         <field name="name" string="Carriage"/>
         <field name="arrival_datetime"/> 
         <field name="voyage_no"/> 
         <field name="transport"/>
         <field name="line_added" column_invisible="1"/> 
         <button name="action_insert_line_service" type="object" string="Add to Service" icon="fa-plus-square-o"/> 
      </tree> 
   </field> 
</page>

I tried this but it did not work, maybe because transport is inside the form?

...
<tree>
         <field name="name" string="Carriage"/> 
         <field name="arrival_datetime"/> 
         <field name="flight_no" column_invisible="transport != 'air'"/>
         <field name="voyage_no" column_invisible="transport != 'ocean'"/> 
         <field name="transport"/> 
         <field name="line_added" column_invisible="1"/> 
         <button name="action_insert_line_service" type="object" string="Add to Service" icon="fa-plus-square-o"/> 
      </tree>

How should I fix this? Should I have 2 trees or 2 main field, each for air and ocean? How can I set-up the condition to display which tree?