Great question. In Zuora right now, there are some great settings under the Billing Settings option that (Define Numbering and SKU formats section) allow one to create sequences for multi-entity opcos but none from what I've seen that deal with the payments angle, which also matters when being audited, along with credit memos (taken care of by Zuora), but also Refunds (also probably a gap). Interesting point you've raised.
