---
title: CancelRx and CancelRxResponse Requirements (R.314)
slug: eprescribing/guide/cancelrx-and-cancelrxresponse-requirements-r314
docTags: 
createdAt: 2026-07-09T20:15:01.843Z
---

# Overview

This section holds the application certification requirements located in the [CancelRx and CancelRxResponse Requirements](docId\:dzEQxDB2pjQCdzSsiEb7t) section in the guide.

## R.314

**R.314:** Receiving systems shall not automatically deny a CancelRx message due to the absence of either the PrescriberOrderNumber or the RelatesToMessageID.