# CMP-128 — An evidence field with nothing to say should be left empty

> Evidence fields that do not apply must be omitted rather than filled with filler text.

- **Rule ID:** CMP-128
- **Layer:** Campaign (`CAMPAIGN`)
- **Checks:** `evidence fields`
- **Severity:** LOW — Best practice. Worth fixing, rarely fatal on its own.
- **When it bites:** Gates approval — get this wrong and registration is refused
- **How it is detected:** AI judgement over the submitted form
- **Fix type:** Fix the field — a better value in the form clears it
- **Required by:** Twilio
- **Applies:** Applies to every 10DLC registration.
- **Canonical URL:** https://ekas.io/rules/10dlc/campaign/cmp-128/

## Why this rule exists

Filler in an evidence field converts a question a reviewer would have skipped into one they now have to resolve, and "N/A" beside a field they expected content in reads as a refusal rather than an absence. It comes from forms that mark every field required, so the submitter types something to get past validation and inherits a finding.

## How to fix it

Clear any field holding "N/A", "none", "see above" or a repeat of another field. Where a form will not accept an empty value, say in one clause why the field does not apply. Done when every populated field carries information.

## Example of a compliant value

```text
A campaign with no paper opt-in leaves the paper-form evidence field empty — not "N/A - we do not use paper forms, see web form above".
```

## Provider rejection codes

| Provider | Code | Resubmission allowed |
| --- | --- | --- |
| Twilio | `30917` | yes |