I want to do a search via xmlrpc from account.invoice.line via the account_invoice_line_tax table which is the many2many table for account.tax.

This is the code, which is not working, becaus account_invoice_line_tax is not a model:
line_tax_ids = sock.execute(dbname, uid, pwd, 'account.invoice.line.tax', 'search', [('invoice_line_id', '=', invoice_line['id'])])

Thank your for your help in advance.