Sort computer assets by column where value is pulled from list.

When viewing computer assets, I can't click a column header to sort by that column value, if the value for that column is pulled from a list ("Admin > Lists").

For example, I have a "Department" field in my computer assets layout, and the value in each record is chosen from a pull down list ("Sales, HR, Finance," etc.). I can't click the "Department" column header while viewing my list of computers to sort by department, but I can click any column where the input value is simply txt or a number.

Would be great it we could click column headers on columns that contain data from a list.