How to apply discount in the invoice and edit a decimal quantity

It has been raised before (see this post), the solution is to enter the unit quantities in the description field. We do support decimal quantities for time based entries but not yet item based entries. You may allow this in the future but only to two decimal places, this will bring it inline with time based entries.

Unfortunately it’s not a trivial fix and regrettably not something we can look in the near term.