AR Grouping Rule

Hello Community - I'm trying to change default grouping rule to reduce the number of transactions created for each billing term.  I created a new grouping rule and used optional attributes, however exported invoices are still used "attribute1" I believe, I see each billing term has each invoice.  system is creating a separate invoice for each rental increase term, we have leases terms over 25 yrs, its very tedious to manage each rent increase as separate invoice.  I appreciate your help.

I also verified if customer site/profile class overriding, but we dont have any profile class setup for the customer I'm working, so it should pick grouping rule from Source,  not sure where I'm missing.