# ONNX027: function-missing-domain

**Code:** `ONNX027`

**Name:** `function-missing-domain`

**Severity:** error

**Category:** spec

**Target:** function

**Fixable:** No

## Message

Function has no domain (required for IR version >= 8).

## Suggestion

Set the domain field on the function.

## Details

For models with IR version 8 or higher, all functions must specify
their domain.