If a single non-malicious code change can break a thing like that with nobody noticing that's a catastrophic failure in testing, QA, and operations (nobody noticed 20% of euros transacted just stopped). It's hard to blame that on IC engineer.
I know that, now. But apart from this incident being in the annals of time as it relates to my work, there absolutely was no fallout, which my mind could not comprehend in those days.
