Manual JV was automatically posted and did not pass through workflow approval

Hi

We had two separate instances wherein manual JV was automatically posted and did not pass through the approval workflow.

Set up on Ledger, Journal sources and employee hierarchy for the approval limits had been in place and it has been working for some time already but there was a sudden breakdown of controls.

Is there any related system profile that could possibly disable or by pass set up in place for manual journal voucher approval?

Thanks and appreciate any feedback

Regards

Lady