If you are a subscriber to the GDSN IAMS Access List Rules Update service, this section allows you to define how often rule updates should be pulled from the GDSN. It also allows you to do an immediate GDSN transaction to update your rules.
Doing an immediate update can take a very long time (5-10 minutes on a decent speed machine), so it is highly recommended that you just configure the system to do rule updates every day, week, or month.