I am searching for an efficient way to retrieve with xmlrpc / proteus the pending invoices (invoices that are unpaid or partially paid).
I tried to use the calculated field 'account.invoice.amount_to_pay' in the search criteria (domain) of model.account.invoice.search() call, but I get the response: xmlrpclib.Fault: <Fault 1: 'UserError\nMissing search function on field "amount_to_pay".\n'> What are your suggestions ?
