Should the Invoiced Amt in Contract Fin Sum always be equal to the Invoice Amt under Billing Control

Summary:

Under Financial Summary tab in Contracts, Invoiced Amount shows 332,920.45.

Under Billing Controls in the Billing tab, Invoiced Amount shows 11,957.46.

Questions:
1. Should these parameters always be equal? If yes, how can we trace where the difference comes from?
2. How is the Invoiced Amount under Billing Control computed? Where does it pull the values from?

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