A related idea would be to extend Subscription.IsInvoiceSeparate. If value is true allow new soft descriptor field to be associated to the subscription and ultimately propegated to invoice and payment.
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Save Opportunity Id to Zuora Subscription object when Quotes are Sent to Zuora.
This will be helpful to enable downstream reporting and billing/accounting audit.
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Seems like the best practice is to implment Purchase Order (PO) at subscription level. How about adding standard field for Purchase Order (PO) on subscription object.
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