InvoiceItem.Quantity will not sum up when using GroupBy filter
Known Issue: When using invoice template which contains GroupBy filter, the InvoiceItem.Quantity field will not sum up under Charge Summary.
Reference Number: BIL-16624
This issue is not a defect. We only support the scenario described in the Zuora knowledge center: http://knowledgecenter.zuora.com/CA_Billing_and_Payments/D_Invoices/Creating_a_Custom_Invoice_Templa.... Group by Quantity is not supported.