---
id: DFMOD-C4-NEG-005
title: "Validation failure on a duplicate never mutates the original form"
product: web
module: digital-form
type: negative
priority: P1
risk: high
status: draft
automationStatus: planned
sourceRefs:
  tsd: PK141
  tsdSection: C4
  tsdScenario: C4.4
  prd: PK141
  jira: null
automationRef: null
lifecycleStatus: active
lifecycleReason: "AI-generated draft from PK141 TSD C4.4 edge case; pending QA review."
lastReviewedAt: null
reviewedBy: null
supersededBy: null
duplicateOf: null
blockedBy: null
preconditionRefs:
  - PRE-DF-form-exists
tags:
  - web
  - digital-form
  - duplicate-form
  - negative
  - validation
  - pk141
  - staging
---
## Objective
Verify a failed validation while saving a duplicate leaves the original form untouched.

## Preconditions
- See [[PRE-DF-form-exists]]
- And a duplicated form has an invalid step

## Steps
1. Attempt to save the duplicate with a validation failure on one step

## Expected Result
- Then save is blocked on the invalid step
- And the original form is not changed in any way

## Source Traceability
- TSD: PK141
- Section: C4 - Duplicate Form
- Scenario: C4.4 - Validation/save (edge case)
- Acceptance Criteria: PRD C.15 Scenario 3-7

## Evidence Required
- Original form state unchanged after duplicate validation failure.

## Notes / Gaps
- No gap.