Bill Run will pick up both, so eventually invoice amount will be 0 amounts. Unless applying Invoice Item Adjustment, 2 line items will be remaining forever with 0 amounts.
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In case of cancelling with backdated cancellation date (bill in advance), it is required to refund the amount already paid by end users. If I do cancellation, subscriptions will be cancelled. And next Bill Run calculates amounts that needs to be refunded (amounts of over payment), then creates negative amount invoices.
Refund function can refund the amount by specifying invoices that are already paid. In case of this, specified invoice will be treated as “not paid”
Therefore, there will be 2 invoices. One invoices ( with positive amount) that is created by refund. And another invoice (with negative amount) that is created by bill run after cancellations.
As for the operational point of view, both positive and negative amount of invoices are not needed. At the same time, account balance will be 0 amounts. However, both invoices will be remaining of you do not do anything.
Meaning, it needs to set both invoices 0 amounts by Invoice Item Adjustment functions.
