Illustrator :: Can't Edit Graph Value Axis When There Are Multiple Graph Types In One Chart

Illustrator can make graphs with lines and bars / columns, for example from the docs: [URL] .....
 
However, when I create a graph like this, I seem to lose the ability to manually set the value axis using "override calculated values".
 
To reproduce this problem: Create a graph like the example, with bars and an axis on the left, lines and an axis on the right. Unlike the example, don't fix the numbers so the lines match up neatly - have one side go up to just under 20, one up to just under 250, so there are mismatched markers and numbers of divisions on each side.Try to make the markers and numbers of divisions match up, so the side that goes up to 20 actually goes up to 25 and has the same number of divisions as the other side.Everything I've tried doesn't work:

If I select the whole graph and go to 'Graph Type', I can't set Value Axis options. In earlier versions it's greyed out, in CS6 I can access it but clicking 'Okay' does nothing.If I select the whole graph and chose one graph type, I can set the Value Axis options, but that selected graph type then applies to the whole chart,If I use the Group Selection tool to select one of the series, and open 'Graph Type' options, changing the Value Axis options has no effectIf I use the Group Selection tool to select all series that share an axis and open 'Graph Type' options, changing the Value Axis options still has no effectIf I use the Group Selection tool to select the axis ticks group itself, or the axis line and axis ticks groups themselves, or the axis labels, axis line and axis ticks, or the axis labels, axis line, axis ticks and associated data series, etc, changing the Value Axis options also has no effect 

It seems like this feature is broken and it seems like the example in the manual was carefully chosen to use a rare combination of numbers where it would actually look right.