Obviously Citibank was at fault here for not understanding how the software was supposed to be used, but they did not write the software Flexcube, Oracle did. A

Obviously Citibank was at fault here for not understanding how the software was supposed to be used, but they did not write the software Flexcube, Oracle did. And if you look at some of the manuals for the software, it is all very poorly designed: https://docs.oracle.com/cd/E53393_01/homepage.htm https://docs.oracle.com/cd/E53393_01/homepage.htm However, Citibank's real mistake was trying to use the software for something it probably was not really designed for. It seems they created a "hack" to make this type of interest-only and rollover payment possible so that they didn't have to bother trying to figure out the correct interest payments for the loan holders.