I can perform a SEARCH in XML-RPC for instance on purchase.order.line table, based on a relationship to a field in the purchase.order table

Example :

server.execute(db, uid, pwd, 'purchase.order.line', 'search', [('order_id.name', '=', 'PO00001') ])

I try to do the same but with the READ method.

No success.

server.execute(db, uid, pwd, 'purchase.order.line', 'read','name','order_id.name')

Returns empty.

This query should fetch the "name" of the line (the product's name) and the "name" of the order, AKA the purchase number.

Is it possible to do such "relationship" work with the READ method ?