Mine was on my first project outside of school, on a large sales compensation system for a software company. We had a mistake in the last summation procedure, which would try to deduct any money belonging to her from the next salary. In some situations, when the retroactive calculation increased the amount of money due for the previous month, the debit was recorded and then never decreased from the next salary. What could start as $ 3.23 in the first month, it will increase to $ 6.46 next month. You can see where this is happening. Although we heard about several user complaints at an early stage, we reject them as a “user error” - sales plans were complicated and it was easy for everyone to understand how much should be paid.But after a few months, the missing money was too big to be ignored - more than $ 2,000,000 did not pay salary checks. Correcting the code was easy, and over the course of several months, there were not many payroll calculations for hundreds of employees.