Can you please consider putting a warning message in enter sales for customers or items that have been ticked as inactive. This will save a lot of heartache. I know they don't appear in the drop down menu but you can still enter sales against inactive customers and sell inactive items.
e.g. Warning - This customer or item is inactive - do not use.
Thanks for your suggestion @AnitaF Anyone who would like to see a warning when selecting an inactive card or item (by directly typing in the card or item name) when entering sales, please cast your vote here.