I have built a custom view based on Opportunity lines. The columns include a column for 'Business Unit' coming from the related 'Opportunity'. And a bunch of other columns.

I want to build a chart, with an X-axis based on "Business Unit", but that columns doesn't appear on the chart ax drop down menu. Why not?
From what I understand all the columns in the view should appear above the dotted line, but they don't for me. Not below the dots either. Am I missing anything?
