Thank you for the response. I believe what you are saying is that 0DATE must be in the list of dimensions?
The problem I have right now is the following.
1. In Properties pane within the Key Date field, I created a variable using 0DATE as reference characteristic. Let's call this variable ZINPUT
2. In the Key figure, I tried to create a text variable using 0DATE replacement path.
3. Select "Replace Variable with: Variable"
4. The list of 0DATE variables do not include ZINPUT