farm/views/medication_event.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
        <data>
            <record model="ir.actions.act_window" id="animal_group_open_medication_events">
	            <field name="domain">[('animal_group', '=', active_ids)]</field>
	            <field name="name">Medication events</field>
	            <field name="res_model">farm.medication.event</field>
            </record>
            <record model="ir.actions.act_window" id="animal_open_medication_events">
                <field name="domain">[('animal', '=', active_ids)]</field>
                <field name="name">Medication events</field>
                <field name="res_model">farm.medication.event</field>
            </record>
            <record id="view_medication_event_tree" model="ir.ui.view">
                <field name="name">medication_event.tree</field>
                <field name="model">farm.medication.event</field>
                <field name="mode">primary</field>
                <field name="inherit_id" ref="view_abstract_event_tree"/>
                <field name="arch" type="xml">
                    <field name="lot" position="after">
                            <field name="feed_product"/>
                    </field>     
                </field>
            </record>
            <record id="view_medication_event_form" model="ir.ui.view">
            <field name="name">mediction_event.form</field>
            <field name="model">farm.medication.event</field>
            <field name="mode">primary</field>
            <field name="inherit_id" ref="view_abstract_event_form"/>
            <field name="arch" type="xml">
            <field name="state" position="after">
                <h1>Medication Event</h1>
                </field>
                <field name="animal_group" position="replace">
                     <field name="medication_in_feed"/>
                     <field name="animal_group" 
                        attrs="{'invisible':['|',('animal_type','!=','group'), ('medication_in_feed', '=', True)],
                            'required':[('animal_type','=','group')]}"
                        domain="[('farm', '=', farm), ('state', '!=', 'sold')]"/> 
                      <field name="medicated_feed" 
                         attrs="{'invisible': [('medication_in_feed', '=', False)]}"/>
                      <field name="feed_product"/>
                      <field name="feed_product_uom_category"/>
                      <field name="feed_quantity"/>
                      <field name="uom"/>
                      <field name="location" domain="[('location_id', '=', farm)]"/>
                      <field name="quantity"/>
                      <field name="feed_location"/>
                      <field name="feed_lot" domain="[('product_id', '=', feed_product)]"/>
                      <field name="start_date"/>
                      <field name="end_date"/>
                      <field name="move"/>
                </field>     
            </field>
        </record>   
        </data>
    </openerp>