'Returns a record object for the provided
:term:`external identifier`
:param xid: fully-qualified :term:`external identifier`, in the form
:samp:`{module}.{identifier}`
:raise: ValueError if not found
:returns: :class:`~odoo.models.BaseModel`'

def browse_ref(self, xid):

    assert ('.' in xid), "this    method    requires    a    fully    qualified    parameter,    in    the    following    form:    'module.identifier'"
    return self.env.ref(xid)
