Feature Request: Allow ability to amend a subscription dated into a period where a bill run has already been executed but there was not an invoice
Reference Number: DE5534
Issue description: Customers cannot cancel a subscription or remove a charge from the subscription on the subscription start date once the subscription has been processed by a bill run with a target date later than the invoice through date of this subscription. For example, a subscription with an annual charge starts on 01/01/2011 and an invoice was generated for the period from 01/01/2011 - 12/31/2011. If a bill run was processed against this account with a target date later than 01/01/2012, even if there is no invoice generated, the subscription cannot be cancelled or no amendment cannot be created with Contract Effective Date as 01/01/2011.
Business Need: Some customers would like Zuora to support Balance Forward accounting so that they can cancel a subscription or amend a charge on the subscription start date even the subscription has been processed by a bill run with a target date later than the invoice through date, so that without modifying the invoice, there will be a negative invoice generated.
Workaround: Process an amendment that would "add" the same Product Rate Plan and set the price to the same NEGATIVE amount.
