This summary is not the rule. The rule text controls.
This rule doesn't contain any content right now. It's marked as "reserved," which means the organization that writes these rules has set aside this spot for a future rule that hasn't been written yet.
You can think of it like a placeholder. Courts and rule-making bodies often number their rules in a specific order, and sometimes they leave gaps for rules they plan to add later, or for rules that used to exist but were removed. Either way, there's nothing here that applies to you or your case right now.
If you're looking for information on trust accounting requirements, you'll need to check the other numbered rules in this set, since this particular spot doesn't have any current requirements or guidance.