Confirm Constraint Logic for Nested SFDC Custom Objects
We have re-architected the way our client subscriptions pull into Salesforce, and the detail we need is on Account>Subscription>Subscription Product & Charges.

I've been able to bring in the necessary fields for that object into Marketo but they're only available as constraints on the subscription so "subscriptions with product & charge: field name." Subscription to Subscription Product & Charge is a 1: many relationship. My concern is that putting constraints like the below would not necessarily query the SAME product & charge line:

So it could look for one that is active but that might not be the one I'm looking for.
Can someone help confirm and/or point me in the direction of an alternative?
Thanks,
Kim