We do not support changing the subscription's Invoice Separately field via an Amendment Quote.
Please note that Amendment Quote creates an amendment, not update a subscription field.
In Zuora when you create an amendment, there is no option to change Invoice Subscription Separately field; To change this field, you need to edit the subscription (without making an amendment). (Zuora UI only)
In other words, Amendment Quote makes amend() call which does not change Invoice The Subscription Separately field while changing this field requires an update() Subscription call. (New Subscription) .
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