Defined Related Lists can be a very simple and useful tool to provide users with information in a related list directly on a form (even if that information is not directly associated with the record being viewed). The Service-now wiki contains documentation on this topic so I won’t cover that here. The point of this article is to point out something that often gets overlooked when working with Defined Related Lists and to share a few Defined Related Lists that I’ve used in the past.
ervice-now allows you to easily create relationships between tables without having to know a whole lot about the underlying table structure. If you’ve ever worked with a reference field then you’ve worked with one of these relationships. A reference field is simply a one-to-many relationship between 2 tables in ServiceNow. The ‘one’ end of the relationship is displayed as a reference field on the form. The ‘many’ end of the relationship is displayed on the referenced table as a related list.
In some cases, it may also be necessary to create a many-to-many relationship in your instance. Because ServiceNow ships with most of these relationships already defined, it’s rare that you’ll have to create one. If you do have to create a many-to-many relationship, here’s how you could do it.