搜索Many2One Field odoo PHP XMLRPC

i'm using this class for accessing odoo through PHP XMLRPC. Everything works fine almost. I can't search many2one fields just by placing the id of the referenced record. I guess there should be a special way to code the many2one id in the search. EG: searching in product.supplierinfo by the product_tmpl_id using this code i get emtpy array returned: for accessing odoo through