# ONNX031: unsorted-function-nodes

**Code:** `ONNX031`

**Name:** `unsorted-function-nodes`

**Severity:** error

**Category:** spec

**Target:** function

**Fixable:** 🔧 Yes

## Message

Function nodes are not in topological order.

## Suggestion

Sort the function's nodes in topological order.

## Details

Nodes within a function must be in topologically sorted order.