<?xml version="1.0"?>
<data><field name="property_account_expense_id" position="attributes">
                    <attribute name="attrs">{'readonly': [('purchase_ok', '=', 0)]}</attribute>
                </field>
                <field name="supplier_taxes_id" position="replace">
                     <field name="supplier_taxes_id" colspan="2" widget="many2many_tags" attrs="{'readonly':[('purchase_ok','=',0)]}" context="{'default_type_tax_use':'purchase'}"/>
                </field>
            </data>