About using the zero-after option
          Note: The zero-after option is a one-time decision that cannot be changed later.
         
         The zero-after option is a function that clears the quantity charged on recurring invoices after each billing period. You can choose the zero-after option both for line items and add-on charges.
If you select the zero-after option, then the application clears the quantity after creating each recurring invoice, requiring you to enter a new quantity each time.
You can choose to zero out charges for these reasons:
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To regularly audit changes in quantity and charges
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To maintain invoice charges that differ for each new billing period