The top row of dropdowns is currently blank. Adding a "--- None ---" or a similar placeholder would improve user experience as the users would be directly informed that there are options to choose from.
However, there should be no empty or "--- None ---" row in required fields.
- The top row is empty for dropdowns such as Net rate scheme in Analysis, Price List in Job reports, and others.
- There is an empty row in the dropdowns of required fields, e.g.: Price List in Quotes.
- A "--- None ---" placeholder is added to the top row of optional dropdowns.
- No placeholder (and no empty top row) is present in required dropdowns.
The "--- None ---" placeholder would provide a more immediate visual cue for users when working with Net rate scheme dropdown in Analysis (an optional one).