Not totally sure if this is what you need, but...
You could create a self-join relationship in the Customers table where APN# = APN#.
You could sort this relationship by recordID or record creation timestamp.
You could then query values in this relationship using GetNthRecord based upon the sort order of the relationship.
"If you eat in the kitchen, your room is always clean, and you go to sleep at 9 o'clock, it means you don't have Internet!! ~anon
Thank you for that info.
Are there any other suggestions?