- <field name="partner_id" on_change="onchange_partner_id(partner_id)" context="{'search_default_customer':1}" attrs="{'readonly': [('state','=','invoiced')]}"/>
+ <field name="partner_id" on_change="onchange_partner_id(partner_id, context)" context="{'search_default_customer':1}" attrs="{'readonly': [('state','=','invoiced')]}"/>