SSAS处理非链接数据

I'm trying to compare forecast data with sales data in a cube. Sometimes we have a forecast with no actual sale, sometimes we have a sale with no forecast. How do just show 0% if one or the other does not exist? This is my current code... Green lines are ok because it is showing 0% where one of the amounts doesn't exist. I want it to do the same for the red circled ones. I'm trying to compare forecast data with sales