Discrepancy in AWS Billing Conductor Pro Forma Invoices

Hello, In our organization, we are using AWS Billing Conductor to generate pro forma invoices for clients. We’ve encountered an issue where there are discrepancies in costs between different sections of the invoice. For example, at the top of the pro forma, in the "AWS Billing Summary," the cost is $107.82.

However, at the bottom, in the "Charges by Account" section, the amount is $107.84.

While the difference is very small—just $0.02—in my organization, this discrepancy needs to be explained. Does anyone know the reason for these differences? Thank you very much!

Resources:

1. https://docs.aws.amazon.com/billingconductor/latest/userguide/abc-proforma-def-bestpractices.html