# PB004: attribute-ref-has-value

**Code:** `PB004`

**Name:** `attribute-ref-has-value`

**Severity:** error

**Category:** protobuf

**Target:** node

**Fixable:** No

## Message

Attribute referring to a parent attribute has its own value field set.

## Suggestion

Remove the value field from the reference attribute.

## Details

An attribute that references a parent attribute (ref_attr_name is set)
should not have its own value field. In onnx_ir, Attr.is_ref()
distinguishes reference attributes.