The problem is that QV redimensions my chart such that my dimensions and expressions no longer visualize in the same manner.
I have 2 dimensions and 1 expression. In a line chart one dimension appears on the x-axis and the other on the y-axis and the expression is what is shown. When I switch to a combo chart and add the bar expression it now shows both dimensions on the x-axis and my expression on the y-axis.
Simply disabling the bar chart expression in the properties fixes this situation. Ultimately, I am back to square 0 ; Any help is appreciated.