---
alias: user-guide-edit-iot-event-definition
description: "Modify existing IoT event definitions, considering potential impacts on system events"
---

# Edit IoT Event Definition

:lock: IoTEventDefinition.**Edit**

## Overview

This operation is used to Edit a Non-System **IoT Event Definition**. To change a System **IoT Event Definition**, see [[user-guide-iot-event-definition-security-permissions]].

## Setup

No specific setup is required other than to meet the preconditions of the transaction.

## Preconditions

* The **IoT Event Definition** exists in the system.
* The Owner Type of the **IoT Event Definition** must be different than System.

## Sequence of Steps

The Edit IoT Event Definition wizard can be called on the top left button from the **IoT Event Definition** page.

All non-system properties can be changed in this wizard and the Name of the **IoT Event Definition** cannot be altered.

![edit_iot_event_definition][edit_iot_event_definition]

!!! warning
    The structure of the IoT Event Definition can be freely altered. Nevertheless, this operation must be performed with caution. You must take into consideration that altering the Event structure can impact the current Events already available in the system. It is safe, however, to add new properties.

[edit_iot_event_definition]: images/edit_iot_event_definition.png