Invoiced Amortized Cost is similar to Discounted Amortized Cost but only the recurring portion of RI and Saving Plan charges are amortized. This ensures that total cost for a billing period only reflects charges incurred in that billing period. Upfront RI/SP charges (either All Upfront or the upfront portion of Partial Upfront) are still represented as separate line items. This cost type is currently only supported for AWS related costs.