I can see in the AL that you can set the NotBlank field attribute to make a field required. If I was creating a custom field then I could make it required however I cannot modify this attribute on stock fields. I have a customer that would like a stock field made required. How can I make a work-around for this? I figure I would need to in a page extension create a OnInsert or OnUpdate validation logic but I don't see any documentation on how to do this properly.