Error Message with SIL Validator

[haa]

When I use the Regular Expression Check (JSU) validator I can set an error message.
According to
https://community.atlassian.com/t5/Jira-questions/Why-does-the-validator-not-show-the-error-message-on-Field/qaq-p/1376065

you can show a message when in the validator with in ScriptRunner

throw new InvalidInputException("message")

 How do I do that in a SIL script?

How do I do this when validating fields in SIL script?

[said kouzibry]

In sil you would do it like so :

return false, "fieldName", "Error message;

For more info : Customizing Workflows with SIL