In List Pages such as the Customer List (Page 22, List), Lines are completely marked when selected. This makes it easy to orientate in which lines the user is.

In sales and purchase documents the lines are only marked on the left side. But with more lines in a document, the visibiity in which line a user is working it is hard to see.

This should be optimized to make it easier, working in sales lines and to see directly in which line a user is working.