A Comprehensive Guide to Salesforce Custom Error in Flows

Particularly when performing Data Manipulation Language (DML) operations. In the context of a Record-Triggered Flow, the execution of DML operations is a common scenario, such as creating, updating, or deleting records. Previously, when such operations encountered issues, the default error messages were generic and didn’t provide specific guidance to end-users.

For instance, in this scenario a user attempts to update a record, but the update violates certain criteria or triggers a validation rule (explained below). Instead of presenting a generic error that might confuse the user, the Custom Error Messages element allows developers to craft a specific error message. This message can explain the nature of the issue, guiding the user on what went wrong and how to rectify it. In this scenario, the flow tries to update the contact linked with this case but due to a validation rule written on the contact the flow is not able to update the contact.

Validation Rule – There’s a custom field of checkbox type named “legal” in contact, if “legal” is true the contact cannot be Updated.
Now, with the introduction of the Custom Error Messages element, developers have a powerful tool to enhance the user experience during these DML operations. When a Record-Triggered Flow fails, perhaps due to validation rules, workflow rules, or other criteria, developers can strategically deploy custom error messages. These messages serve as a bridge between the technical details of the error and a user-friendly interface.