Unheard of: bank makes error in customer's favor

Somehow, two bank employees at Citigroup charged with reviewing the
transaction failed to catch the mistake in what was supposed to be a
transfer of $280 into a client's account in April, 2024.

The $81tn 'near miss' at Citi
Plus, BP goes back to basics amid Elliott's pressure campaign and
ex-Barclays chief Jes Staley wants to clear his name
Due Diligence daily briefing
Financial Times
February 28, 2025
https://www.ft.com/content/86d7b252-be88-4ddc-a803-f9a94995e158

Steve Lehto video
https://www.youtube.com/watch?v=LE62kLLNBxU

I don't understand how funds were transferred given that the monies
didn't exist in the first place.