When I enter the details in the line in the input screen of any kind of transaction I really would like the tab order to go to the Add line button instead of going to the Total amount field. In this way I don’t need my mouse to create input lines.
An other possibility would be to use short keys (e.g. ctrl/cmd whatever) but I noticed no short keys in the application at all, so the impact of this change would be larger then changing the tab order.
The (Total) amount fields should not be in the tab order because they are read only fields.