FileMaker Custom Messages for Validation Errors

Sometimes you can’t see something because it’s straight in-front of your eyes. So if you’re looking for how to display a custom validation message when validating a field then it’s right at the bottom of the validation pane for that field:

And yup I had to google to find this out. This is what happens when you have been focusing on your database design for too long!

Unfortunately there is not too much space. So you’re validation message will have to be short but sweet.