I tried to plot two curves in the same chart (either a line chart or combo chart). Two dimensions. One of them is month. Another is region (values: Domestic or Oversea). Expression is Sales. I have another field for selection PRODUCT (A, B, or C). Before selection, I can see two curves in the plot, one for domestic and another for oversea. When I select one of the products (e.g. A), the curve for oversea disappeared. I don't know how to correct the behavior.
Fog eg : initially you are viewing data for all Products , when you are selecting Product A, there might not be any data for Month of Jan , Feb. or There might be data for only one month.
