Flash message also known as popup or toast messages are used to communicate with users and to inform them of important changes or errors that has occurred while they interact with record forms.

To set up a new flash message that is not in the "out-of-the-box" installation, you need to:

1. Create a source message.
2. Create message translations.
3. Configure the business rule whose conditions trigger the message display.

Create a source message

All flash message texts are stored in the Source Messages (source_message) table.

To create a new flash message, complete the following steps: 

1. Navigate to System Localization → Source Messages.
2. Click New and fill in the Message field.
3. Click Save or Save and Exit.

You can also add translations of this message to any language. See more in the Localization and Multi-language Support article.

Configure a business rule

To display the message when a business rule is executed, configure the following parameters when creating or updating a business rule record:

• On the Action tab, select the Add Message checkbox.
• In the Message field that appears, enter the message you need. Enter the message from the Source Messages table for it to be localized.

For more information about creating business rules, see Business Rules.