I know you can set levels for each sales code (stock items) below which there is a warning if the stock level drops below this threshold.
However, so far as I know the only difference this makes is the colour of the stock item changes when you try adding it as an invoice line.
It would be helpful if I could set an alert so that I received an email as soon as the stock count of a sales code drops below this threshold, and also when the stock level reaches 0.