Not exactly a killer feature, but this limitation has cropped up more than a few times…
Sales invoices have always been rigid in terms of the decimalisation on quantities. Originally you were only able to use whole number quantities on both sales items and tasks. We later loosened that restriction to allow for up to 2 decimal places on tasks only.
We have now extended the quantity to allow for up to 4 decimal places on both items and tasks.
Our previous advice was to include any longer decimal quantities in the item description, this update however should provide a great deal more flexibility and improve the way invoices are presented when using more granular quantities.