<field class="oe_form_inline" name="expense_to_invoice" attrs="{'invisible': [('charge_expenses','=',False)]}"/>
</td><td>
<button name="open_hr_expense" string="All Expenses" type="object" attrs="{'invisible': [('charge_expenses','=',False)]}"/>
<field class="oe_form_inline" name="expense_to_invoice" attrs="{'invisible': [('charge_expenses','=',False)]}"/>
</td><td>
<button name="open_hr_expense" string="All Expenses" type="object" attrs="{'invisible': [('charge_expenses','=',False)]}"/>