# PB003: attribute-multiple-value-fields

**Code:** `PB003`

**Name:** `attribute-multiple-value-fields`

**Severity:** error

**Category:** protobuf

**Target:** node

**Fixable:** No

## Message

Attribute contains more than one value field.

## Suggestion

Set only one value field on the attribute.

## Details

In protobuf, an attribute should contain exactly one value field.
This is enforced by the IR type system and cannot occur with onnx_ir.