Add ability to Join on Parameters
If you create a report with sub-queries and parameters, you can add the parameter to the main query, but you won't see it in the join list when configuring the join for the sub-query. You also can't drag the parameter into the sub-queries filter section with the following message:
This indicates this is expected behavior, but we'd like to use this functionality to "hot swap" values. This works when there's one main query, but not when there are sub-queries.