<field name="method_period"/>
<field name="method_end" attrs="{'required': [('method_time','=','end')], 'invisible':[('method_time','=','number')]}"/>
<newline/>
<field name="method_period"/>
<field name="method_end" attrs="{'required': [('method_time','=','end')], 'invisible':[('method_time','=','number')]}"/>
<newline/>