Edit Expense Form layout is sub-optimal and tabbing between fields is broken
If you have filled out all the fields on the Edit Expense form, and then change the Report, you lose the value you had entered in the Category field. It would, therefore, make more sense to have the Report field as the first field on the form.
Also, you can complete the Form with keyboard only. So you need to constantly switch between keyboard and mouse which is time-consuming and frustrating when you have a lot of receipts to enter. You can tab down through the fields, but there's no way to select/deselect the Reimbursable checkbox.
Having the Report field last also breaks the ability to enter receipts using the keyboard.