We are a small, start up sort of company. I'm in charge of a lot of stuff, like finance, purchasing, IT, HR.
The fuck up regards purchasing. I forgot to send forecasts to our factory (three months in a row!), for them to reserve capacity. This resulted in them not having enough capacity to produce two big orders, which fucks up a launch in a new territory (we are too late to match their marketing efforts) and us missing our total company yearly sales targets by -5%.
However, since as soon they fire me everything regarding finance and stock goes to shit, I'm covered for now.