-+ <group colspan="2" col="2">
-+ <separator string="General" colspan="2"/>
-+ <field name="course_id"/>
-+ <field name="name"/>
-+ <field name="instructor_id"/>
-+ </group>
-+ <group colspan="2" col="2">
-+ <separator string="Schedule" colspan="2"/>
-+ <field name="start_date"/>
-+ <field name="duration"/>
-+ <field name="seats"/>
-+ </group>
-+ <separator string="Attendees" colspan="4"/>
-+ <field name="attendee_ids" colspan="4" nolabel="1"/>
++ <sheet>
++ <group>
++ <group string="General">
++ <field name="course_id"/>
++ <field name="name"/>
++ <field name="instructor_id"/>
++ </group>
++ <group string="Schedule">
++ <field name="start_date"/>
++ <field name="duration"/>
++ <field name="seats"/>
++ </group>
++ </group>
++ <label for="attendee_ids"/>
++ <field name="attendee_ids"/>
++ </sheet>