Trying to find the last committed SCN

My developers have told me that schema refreshes (export/import) done via DataPump (without using either of the FLASHBACK_* parameters) have caused some sequences to be out of sync with the data in their associated tables. My research into the DataPump documentation directs me to the FLASHBACK_SCN parameter, but the only method I find in documentation to find an SCN is to use DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER to get the current SCN. However, to ensure we resolve the aforementioned issue of out-of-sync objects, I would prefer to use the last committed SCN. Unfortunately, I can find no documentation to suggest how I might derive that value. Can anyone here point me in the right direction for this, or perhaps even provide a solution?
Thank you in advance for your attention, consideration, and enlightened feedback!
Mark C (a.k.a. user621573)

Sequences are database objects but are not really protected by transactions: if you rollback your transaction that doesn't rollbacks sequence numbers. I'm not sure that using some SCN parameters is the solution for Data Pump.
There are known limitations when using old export/import.
I cannot find documentation about Data Pump limitations when dealing with sequences.

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Welcome to the forum!
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