[mannykannot]

> ...Colleagues who are supposed to catch such errors didn’t.

This might well be a case of to be the hard problem of shared responsibility becoming someone else's responsibility.

There is no perfect solution - even the implicit death penalty does not prevent avoidable airplane crashes (AF 447, PIA 8303...) - but it seems that things could have been done better here, as indicated by the preceding sentences:

"After Revlon repurchased part of the debt, a Citigroup employee was supposed to manually adjust the share of the loan the remaining lenders still owned ahead of interest payments scheduled to be sent out this month."

It is asking for trouble to have a process that allows you to start a task having no immediate, irreversible consequences, but which presents few or no barriers to accidentally executing one that does. Were the "colleagues who are supposed to catch such errors" notified of the actual transaction that was about to be performed, or only of the one that was intended?