Isis bb are stoneage
All business's have issues with stock control, Especialy if the business is large and the system is not live,
For example in Cyclesurgery a guy could check stock of your BB and it shows its in another store. At the same time the other store could be selling the item or having it stolen.
But there are loads of case where items can be fitted to a bike as part of a repair and recorded as an other item, like 113mm bb rather than 111mm bb.
In theory its simple in but its not in practice